diff --git a/aiogram/api/client/session/aiohttp.py b/aiogram/api/client/session/aiohttp.py
index 28ca6db0..9ac73eaa 100644
--- a/aiogram/api/client/session/aiohttp.py
+++ b/aiogram/api/client/session/aiohttp.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
-import copy
-from typing import Any, Callable, Dict, Optional, TypeVar, cast
+from typing import Callable, Optional, TypeVar, cast
 
 from aiohttp import ClientSession, FormData
 
@@ -60,17 +59,3 @@ class AiohttpSession(BaseSession):
     async def __aenter__(self) -> AiohttpSession:
         await self.create_session()
         return self
-
-    def __deepcopy__(self: T, memo: Optional[Dict[int, Any]] = None) -> T:
-        if memo is None:  # pragma: no cover
-            # This block was never be called
-            memo = {}
-
-        cls = self.__class__
-        result = cls.__new__(cls)
-        memo[id(self)] = result
-        for key, value in self.__dict__.items():
-            # aiohttp ClientSession cannot be copied.
-            copied_value = copy.deepcopy(value, memo=memo) if key != "_session" else None
-            setattr(result, key, copied_value)
-        return result
diff --git a/aiogram/dispatcher/event/handler.py b/aiogram/dispatcher/event/handler.py
index 42c6202d..52e8c0da 100644
--- a/aiogram/dispatcher/event/handler.py
+++ b/aiogram/dispatcher/event/handler.py
@@ -1,7 +1,7 @@
 import inspect
 from dataclasses import dataclass, field
 from functools import partial
-from typing import Any, Awaitable, Callable, Dict, List, Tuple, Union
+from typing import Any, Awaitable, Callable, Dict, List, Optional, Tuple, Union
 
 from aiogram.dispatcher.filters.base import BaseFilter
 from aiogram.dispatcher.handler.base import BaseHandler
@@ -10,7 +10,7 @@ CallbackType = Callable[[Any], Awaitable[Any]]
 SyncFilter = Callable[[Any], Any]
 AsyncFilter = Callable[[Any], Awaitable[Any]]
 FilterType = Union[SyncFilter, AsyncFilter, BaseFilter]
-HandlerType = Union[CallbackType, BaseHandler]
+HandlerType = Union[FilterType, BaseHandler]
 
 
 @dataclass
@@ -47,7 +47,7 @@ class FilterObject(CallableMixin):
 @dataclass
 class HandlerObject(CallableMixin):
     callback: HandlerType
-    filters: List[FilterObject]
+    filters: Optional[List[FilterObject]] = None
 
     def __post_init__(self):
         super(HandlerObject, self).__post_init__()
@@ -56,6 +56,8 @@ class HandlerObject(CallableMixin):
             self.awaitable = True
 
     async def check(self, *args: Any, **kwargs: Any) -> Tuple[bool, Dict[str, Any]]:
+        if not self.filters:
+            return True, {}
         for event_filter in self.filters:
             check = await event_filter.call(*args, **kwargs)
             if not check:
diff --git a/aiogram/dispatcher/event/observer.py b/aiogram/dispatcher/event/observer.py
index 93115ab7..93f4aac6 100644
--- a/aiogram/dispatcher/event/observer.py
+++ b/aiogram/dispatcher/event/observer.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-import copy
+from itertools import chain
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -34,15 +34,11 @@ class EventObserver:
     def __init__(self) -> None:
         self.handlers: List[HandlerObject] = []
 
-    def register(self, callback: HandlerType, *filters: FilterType) -> HandlerType:
+    def register(self, callback: HandlerType) -> HandlerType:
         """
         Register callback with filters
         """
-        self.handlers.append(
-            HandlerObject(
-                callback=callback, filters=[FilterObject(filter_) for filter_ in filters]
-            )
-        )
+        self.handlers.append(HandlerObject(callback=callback))
         return callback
 
     async def trigger(self, *args: Any, **kwargs: Any) -> AsyncGenerator[Any, None]:
@@ -51,22 +47,18 @@ class EventObserver:
         Handler will be called when all its filters is pass.
         """
         for handler in self.handlers:
-            kwargs_copy = copy.copy(kwargs)
-            result, data = await handler.check(*args, **kwargs)
-            if result:
-                kwargs_copy.update(data)
-                try:
-                    yield await handler.call(*args, **kwargs_copy)
-                except SkipHandler:
-                    continue
+            try:
+                yield await handler.call(*args, **kwargs)
+            except SkipHandler:
+                continue
 
-    def __call__(self, *args: FilterType) -> Callable[[CallbackType], CallbackType]:
+    def __call__(self) -> Callable[[CallbackType], CallbackType]:
         """
         Decorator for registering event handlers
         """
 
         def wrapper(callback: CallbackType) -> CallbackType:
-            self.register(callback, *args)
+            self.register(callback)
             return callback
 
         return wrapper
@@ -148,16 +140,28 @@ class TelegramEventObserver(EventObserver):
         Register event handler
         """
         resolved_filters = self.resolve_filters(bound_filters)
-        return super().register(callback, *filters, *resolved_filters)
+        self.handlers.append(
+            HandlerObject(
+                callback=callback,
+                filters=[FilterObject(filter_) for filter_ in chain(resolved_filters, filters)],
+            )
+        )
+        return callback
 
     async def trigger(self, *args: Any, **kwargs: Any) -> AsyncGenerator[Any, None]:
         """
         Propagate event to handlers and stops propagation on first match.
         Handler will be called when all its filters is pass.
         """
-        async for result in super(TelegramEventObserver, self).trigger(*args, **kwargs):
-            yield result
-            break
+        for handler in self.handlers:
+            result, data = await handler.check(*args, **kwargs)
+            if result:
+                kwargs.update(data)
+                try:
+                    yield await handler.call(*args, **kwargs)
+                except SkipHandler:
+                    continue
+                break
 
     def __call__(
         self, *args: FilterType, **bound_filters: BaseFilter
diff --git a/aiogram/dispatcher/filters/base.py b/aiogram/dispatcher/filters/base.py
index fabaaf21..c0a6c377 100644
--- a/aiogram/dispatcher/filters/base.py
+++ b/aiogram/dispatcher/filters/base.py
@@ -10,7 +10,7 @@ class BaseFilter(ABC, BaseModel):
         # error: Signature of "__call__" incompatible with supertype "BaseFilter"  [override]
         # https://mypy.readthedocs.io/en/latest/error_code_list.html#check-validity-of-overrides-override
 
-        __call__: Any
+        pass
     else:  # pragma: no cover
 
         @abstractmethod
diff --git a/aiogram/dispatcher/filters/command.py b/aiogram/dispatcher/filters/command.py
index c97f79fa..6eef0c3c 100644
--- a/aiogram/dispatcher/filters/command.py
+++ b/aiogram/dispatcher/filters/command.py
@@ -2,7 +2,9 @@ from __future__ import annotations
 
 import re
 from dataclasses import dataclass, field
-from typing import Any, Dict, List, Match, Optional, Pattern, Union
+from typing import Any, Dict, Match, Optional, Pattern, Sequence, Union, cast
+
+from pydantic import validator
 
 from aiogram import Bot
 from aiogram.api.types import Message
@@ -12,11 +14,19 @@ CommandPatterType = Union[str, re.Pattern]  # type: ignore
 
 
 class Command(BaseFilter):
-    commands: List[CommandPatterType]
+    commands: Union[Sequence[CommandPatterType], CommandPatterType]
     commands_prefix: str = "/"
     commands_ignore_case: bool = False
     commands_ignore_mention: bool = False
 
+    @validator("commands", always=True)
+    def _validate_commands(
+        cls, value: Union[Sequence[CommandPatterType], CommandPatterType]
+    ) -> Sequence[CommandPatterType]:
+        if isinstance(value, (str, re.Pattern)):
+            value = [value]
+        return value
+
     async def __call__(self, message: Message, bot: Bot) -> Union[bool, Dict[str, Any]]:
         if not message.text:
             return False
@@ -50,7 +60,7 @@ class Command(BaseFilter):
                 return False
 
         # Validate command
-        for allowed_command in self.commands:
+        for allowed_command in cast(Sequence[CommandPatterType], self.commands):
             # Command can be presented as regexp pattern or raw string
             # then need to validate that in different ways
             if isinstance(allowed_command, Pattern):  # Regexp
diff --git a/aiogram/dispatcher/filters/content_types.py b/aiogram/dispatcher/filters/content_types.py
index 0f8134e2..1f195663 100644
--- a/aiogram/dispatcher/filters/content_types.py
+++ b/aiogram/dispatcher/filters/content_types.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, Optional, Union
+from typing import Any, Dict, Optional, Sequence, Union
 
 from pydantic import validator
 
@@ -8,12 +8,16 @@ from .base import BaseFilter
 
 
 class ContentTypesFilter(BaseFilter):
-    content_types: Optional[List[str]] = None
+    content_types: Optional[Union[Sequence[str], str]] = None
 
-    @validator("content_types", always=True)
-    def _validate_content_types(cls, value: Optional[List[str]]) -> Optional[List[str]]:
+    @validator("content_types")
+    def _validate_content_types(
+        cls, value: Optional[Union[Sequence[str], str]]
+    ) -> Optional[Sequence[str]]:
         if not value:
             value = [ContentType.TEXT]
+        if isinstance(value, str):
+            value = [value]
         allowed_content_types = set(ContentType.all())
         bad_content_types = set(value) - allowed_content_types
         if bad_content_types:
@@ -23,5 +27,5 @@ class ContentTypesFilter(BaseFilter):
     async def __call__(self, message: Message) -> Union[bool, Dict[str, Any]]:
         if not self.content_types:  # pragma: no cover
             # Is impossible but needed for valid typechecking
-            return False
+            self.content_types = [ContentType.TEXT]
         return ContentType.ANY in self.content_types or message.content_type in self.content_types
diff --git a/aiogram/dispatcher/filters/text.py b/aiogram/dispatcher/filters/text.py
index 71586e7e..8a94cd7b 100644
--- a/aiogram/dispatcher/filters/text.py
+++ b/aiogram/dispatcher/filters/text.py
@@ -1,10 +1,12 @@
-from typing import Any, Dict, List, Optional, Set, Tuple, Union
+from typing import Any, Dict, Optional, Sequence, Union
 
 from pydantic import root_validator
 
 from aiogram.api.types import CallbackQuery, InlineQuery, Message, Poll
 from aiogram.dispatcher.filters import BaseFilter
 
+TextType = str
+
 
 class Text(BaseFilter):
     """
@@ -12,14 +14,14 @@ class Text(BaseFilter):
     InlineQuery or Poll question.
     """
 
-    text: Optional[Union[str, List[str], Set[str], Tuple[str]]] = None
-    text_contains: Optional[Union[str, List[str], Set[str], Tuple[str]]] = None
-    text_startswith: Optional[Union[str, List[str], Set[str], Tuple[str]]] = None
-    text_endswith: Optional[Union[str, List[str], Set[str], Tuple[str]]] = None
+    text: Optional[Union[Sequence[TextType], TextType]] = None
+    text_contains: Optional[Union[Sequence[TextType], TextType]] = None
+    text_startswith: Optional[Union[Sequence[TextType], TextType]] = None
+    text_endswith: Optional[Union[Sequence[TextType], TextType]] = None
     text_ignore_case: bool = False
 
     @root_validator
-    def validate_constraints(cls, values: Dict[str, Any]) -> Dict[str, Any]:
+    def _validate_constraints(cls, values: Dict[str, Any]) -> Dict[str, Any]:
         # Validate that only one text filter type is presented
         used_args = set(
             key for key, value in values.items() if key != "text_ignore_case" and value is not None
diff --git a/docs/dispatcher/filters/command.md b/docs/dispatcher/filters/command.md
index 5ce340c9..5d8ab771 100644
--- a/docs/dispatcher/filters/command.md
+++ b/docs/dispatcher/filters/command.md
@@ -7,7 +7,7 @@ Works only with [Message](../../api/types/message.md) events which have the `tex
 ## Specification
 | Argument | Type | Description |
 | --- | --- | --- |
-| `commands` |  `#!python3 List[CommandPatterType]` | List of commands (string or compiled regexp patterns) |
+| `commands` |  `#!python3 Union[Sequence[Union[str, re.Pattern]], Union[str, re.Pattern]]` | List of commands (string or compiled regexp patterns) |
 | `commands_prefix` |  `#!python3 str` | Prefix for command. Prefix is always is single char but here you can pass all of allowed prefixes, for example: `"/!"` will work with commands prefixed by  `"/"` or `"!"` (Default: `"/"`). |
 | `commands_ignore_case` |  `#!python3 bool` | Ignore case (Does not work with regexp, use flags instead. Default: `False`) |
 | `commands_ignore_mention` |  `#!python3 bool` | Ignore bot mention. By default bot can not handle commands intended for other bots (Default: `False`) |
@@ -15,7 +15,7 @@ Works only with [Message](../../api/types/message.md) events which have the `tex
 
 ## Usage
 
-1. Filter single variant of commands: `#!python3 Command(commands=["start"])`
+1. Filter single variant of commands: `#!python3 Command(commands=["start"])` or `#!python3 Command(commands="start")`
 1. Handle command by regexp pattern: `#!python3 Command(commands=[re.compile(r"item_(\d+)")])`
 1. Match command by multiple variants: `#!python3 Command(commands=["item", re.compile(r"item_(\d+)")])`
 1. Handle commands in public chats intended for other bots: `#!python3 Command(commands=["command"], commands)`
diff --git a/docs/dispatcher/filters/content_types.md b/docs/dispatcher/filters/content_types.md
index 30a635b1..a37006e3 100644
--- a/docs/dispatcher/filters/content_types.md
+++ b/docs/dispatcher/filters/content_types.md
@@ -19,11 +19,11 @@ Or used from filters factory by passing corresponding arguments to handler regis
 
 | Argument | Type | Description |
 | --- | --- | --- |
-| `content_types` | `#!python3 Optional[List[str]]` | List of allowed content types |
+| `content_types` | `#!python3 Optional[Union[Sequence[str], str]]` | List of allowed content types |
 
 ## Usage
 
-1. Single content type: `#!python3 ContentTypesFilter(content_types=["sticker"])`
+1. Single content type: `#!python3 ContentTypesFilter(content_types=["sticker"])` or `#!python3 ContentTypesFilter(content_types="sticker")`
 1. Multiple content types: `#!python3 ContentTypesFilter(content_types=["sticker", "photo"])`
 1. Recommended: With usage of `ContentType` helper: `#!python3 ContentTypesFilter(content_types=[ContentType.PHOTO])`
 1. Any content type: `#!python3 ContentTypesFilter(content_types=[ContentType.ANY])`
diff --git a/docs/dispatcher/filters/text.md b/docs/dispatcher/filters/text.md
index 7c7338aa..0691459b 100644
--- a/docs/dispatcher/filters/text.md
+++ b/docs/dispatcher/filters/text.md
@@ -18,10 +18,10 @@ Or used from filters factory by passing corresponding arguments to handler regis
 
 | Argument | Type | Description |
 | --- | --- | --- |
-| `text` | `#!python3 Optional[Union[str, List[str], Set[str], Tuple[str]]]` | Text equals value or one of values |
-| `text_contains` | `#!python3 Optional[Union[str, List[str], Set[str], Tuple[str]]]` | Text contains value or one of values |
-| `text_startswith` | `#!python3 Optional[Union[str, List[str], Set[str], Tuple[str]]]` | Text starts with value or one of values |
-| `text_endswith` | `#!python3 Optional[Union[str, List[str], Set[str], Tuple[str]]]` | Text ends with value or one of values |
+| `text` | `#!python3 Optional[Union[Sequence[str], str]]` | Text equals value or one of values |
+| `text_contains` | `#!python3 Optional[Union[Sequence[str], str]]` | Text contains value or one of values |
+| `text_startswith` | `#!python3 Optional[Union[Sequence[str], str]]` | Text starts with value or one of values |
+| `text_endswith` | `#!python3 Optional[Union[Sequence[str], str]]` | Text ends with value or one of values |
 | `text_ignore_case` | `#!python3 bool` | Ignore case when checks (Default: `#!python3 False`) |
 
 !!! warning
diff --git a/docs/dispatcher/observer.md b/docs/dispatcher/observer.md
index 222503e9..b98db9b6 100644
--- a/docs/dispatcher/observer.md
+++ b/docs/dispatcher/observer.md
@@ -14,12 +14,11 @@ Reference: `#!python3 aiogram.dispatcher.event.observer.EventObserver`
 That is base observer for all events.
 
 ### Base registering method
-Method: `<observer>.register(callback, filter1, filter2, ...)`
+Method: `<observer>.register()`
 
 | Argument | Type | Description |
 | --- | --- | --- |
 | `callback` | `#!python3 Callable[[Any], Awaitable[Any]]` | Event handler |
-| `*filters` | `#!python3 Union[Callable[[Any], Any], Callable[[Any], Awaitable[Any]], BaseFilter]` | Ordered filters set |
 
 Will return original callback.
 
@@ -28,14 +27,15 @@ Will return original callback.
 
 Usage:
 ```python3
-@<observer>(filter1, filter2, ...)
+@<observer>()
 async def handler(*args, **kwargs):
     pass
 ```
 
 ## TelegramEventObserver
 Is subclass of [EventObserver](#eventobserver) with some differences.
-In this handler can be bounded filters which can be used as keyword arguments instead of writing full references when you register new handlers.
+Here you can register handler with filters or bounded filters which can be used as keyword arguments instead of writing full references when you register new handlers.
+This observer will stops event propagation when first handler is pass.
 
 ### Registering bound filters
 
@@ -44,7 +44,7 @@ Bound filter should be subclass of [BaseFilter](filters/index.md)
 `#!python3 <observer>.bind_filter(MyFilter)`
 
 ### Registering handlers
-Method: `EventObserver.register(callback, filter1, filter2, ..., bound_filter=value, ...)`
+Method: `TelegramEventObserver.register(callback, filter1, filter2, ..., bound_filter=value, ...)`
 In this method is added bound filters keywords interface.
 
 | Argument | Type | Description |
@@ -52,3 +52,13 @@ In this method is added bound filters keywords interface.
 | `callback` | `#!python3 Callable[[Any], Awaitable[Any]]` | Event handler |
 | `*filters` | `#!python3 Union[Callable[[Any], Any], Callable[[Any], Awaitable[Any]], BaseFilter]` | Ordered filters set |
 | `**bound_filters` | `#!python3 Any` | Bound filters |
+
+
+### Decorator-style registering event handler with filters
+
+Usage:
+```python3
+@<observer>(filter1, filter2, ...)
+async def handler(*args, **kwargs):
+    pass
+```
diff --git a/tests/test_api/test_client/test_session/test_aiohttp_session.py b/tests/test_api/test_client/test_session/test_aiohttp_session.py
index ac93b1a7..edde8057 100644
--- a/tests/test_api/test_client/test_session/test_aiohttp_session.py
+++ b/tests/test_api/test_client/test_session/test_aiohttp_session.py
@@ -1,4 +1,3 @@
-import copy
 from typing import AsyncContextManager
 
 import aiohttp
@@ -123,11 +122,3 @@ class TestAiohttpSession:
                 assert session == ctx
             mocked_close.awaited_once()
             mocked_create_session.awaited_once()
-
-    @pytest.mark.asyncio
-    async def test_deepcopy(self):
-        # Session should be copied without aiohttp.ClientSession
-        async with AiohttpSession() as session:
-            cloned_session = copy.deepcopy(session)
-            assert cloned_session != session
-            assert cloned_session._session is None
diff --git a/tests/test_dispatcher/test_event/test_observer.py b/tests/test_dispatcher/test_event/test_observer.py
index 2f157850..a4029197 100644
--- a/tests/test_dispatcher/test_event/test_observer.py
+++ b/tests/test_dispatcher/test_event/test_observer.py
@@ -39,68 +39,38 @@ class MyFilter3(MyFilter1):
 
 
 class TestEventObserver:
-    @pytest.mark.parametrize(
-        "count,handler,filters",
-        (
-            pytest.param(5, my_handler, []),
-            pytest.param(3, my_handler, [lambda event: True]),
-            pytest.param(
-                2,
-                my_handler,
-                [lambda event: True, lambda event: False, lambda event: {"ok": True}],
-            ),
-        ),
-    )
-    def test_register_filters(self, count, handler, filters):
+    @pytest.mark.parametrize("count,handler", ([5, my_handler], [3, my_handler], [2, my_handler]))
+    def test_register_filters(self, count, handler):
         observer = EventObserver()
 
         for index in range(count):
             wrapped_handler = functools.partial(handler, index=index)
-            observer.register(wrapped_handler, *filters)
+            observer.register(wrapped_handler)
             registered_handler = observer.handlers[index]
 
             assert len(observer.handlers) == index + 1
             assert isinstance(registered_handler, HandlerObject)
             assert registered_handler.callback == wrapped_handler
-            assert len(registered_handler.filters) == len(filters)
+            assert not registered_handler.filters
 
-    @pytest.mark.parametrize(
-        "count,handler,filters",
-        (
-            pytest.param(5, my_handler, []),
-            pytest.param(3, my_handler, [lambda event: True]),
-            pytest.param(
-                2,
-                my_handler,
-                [lambda event: True, lambda event: False, lambda event: {"ok": True}],
-            ),
-        ),
-    )
-    def test_register_filters_via_decorator(self, count, handler, filters):
+    @pytest.mark.parametrize("count,handler", ([5, my_handler], [3, my_handler], [2, my_handler]))
+    def test_register_filters_via_decorator(self, count, handler):
         observer = EventObserver()
 
         for index in range(count):
             wrapped_handler = functools.partial(handler, index=index)
-            observer(*filters)(wrapped_handler)
+            observer()(wrapped_handler)
             registered_handler = observer.handlers[index]
 
             assert len(observer.handlers) == index + 1
             assert isinstance(registered_handler, HandlerObject)
             assert registered_handler.callback == wrapped_handler
-            assert len(registered_handler.filters) == len(filters)
-
-    @pytest.mark.asyncio
-    async def test_trigger_rejected(self):
-        observer = EventObserver()
-        observer.register(my_handler, lambda event: False)
-
-        results = [result async for result in observer.trigger(42)]
-        assert results == []
+            assert not registered_handler.filters
 
     @pytest.mark.asyncio
     async def test_trigger_accepted_bool(self):
         observer = EventObserver()
-        observer.register(my_handler, lambda event: True)
+        observer.register(my_handler)
 
         results = [result async for result in observer.trigger(42)]
         assert results == [42]
@@ -108,23 +78,12 @@ class TestEventObserver:
     @pytest.mark.asyncio
     async def test_trigger_with_skip(self):
         observer = EventObserver()
-        observer.register(skip_my_handler, lambda event: True)
-        observer.register(my_handler, lambda event: False)
-        observer.register(my_handler, lambda event: True)
+        observer.register(skip_my_handler)
+        observer.register(my_handler)
+        observer.register(my_handler)
 
         results = [result async for result in observer.trigger(42)]
-        assert results == [42]
-
-    @pytest.mark.asyncio
-    async def test_trigger_right_context_in_handlers(self):
-        observer = EventObserver()
-        observer.register(
-            pipe_handler, lambda event: {"a": 1}, lambda event: False
-        )  # {"a": 1} should not be in result
-        observer.register(pipe_handler, lambda event: {"b": 2})
-
-        results = [result async for result in observer.trigger(42)]
-        assert results == [((42,), {"b": 2})]
+        assert results == [42, 42]
 
 
 class TestTelegramEventObserver:
@@ -144,9 +103,9 @@ class TestTelegramEventObserver:
         assert MyFilter in event_observer.filters
 
     def test_resolve_filters_chain(self):
-        router1 = Router()
-        router2 = Router()
-        router3 = Router()
+        router1 = Router(use_builtin_filters=False)
+        router2 = Router(use_builtin_filters=False)
+        router3 = Router(use_builtin_filters=False)
         router1.include_router(router2)
         router2.include_router(router3)
 
@@ -168,7 +127,7 @@ class TestTelegramEventObserver:
         assert MyFilter3 in filters_chain3
 
     def test_resolve_filters(self):
-        router = Router()
+        router = Router(use_builtin_filters=False)
         observer = router.message_handler
         observer.bind_filter(MyFilter1)
 
@@ -189,7 +148,7 @@ class TestTelegramEventObserver:
             assert observer.resolve_filters({"test": ...})
 
     def test_register(self):
-        router = Router()
+        router = Router(use_builtin_filters=False)
         observer = router.message_handler
         observer.bind_filter(MyFilter1)
 
@@ -214,7 +173,7 @@ class TestTelegramEventObserver:
         assert MyFilter1(test="PASS") in callbacks
 
     def test_register_decorator(self):
-        router = Router()
+        router = Router(use_builtin_filters=False)
         observer = router.message_handler
 
         @observer()
@@ -226,7 +185,7 @@ class TestTelegramEventObserver:
 
     @pytest.mark.asyncio
     async def test_trigger(self):
-        router = Router()
+        router = Router(use_builtin_filters=False)
         observer = router.message_handler
         observer.bind_filter(MyFilter1)
         observer.register(my_handler, test="ok")
@@ -241,3 +200,38 @@ class TestTelegramEventObserver:
 
         results = [result async for result in observer.trigger(message)]
         assert results == [message]
+
+    @pytest.mark.parametrize(
+        "count,handler,filters",
+        (
+            [5, my_handler, []],
+            [3, my_handler, [lambda event: True]],
+            [2, my_handler, [lambda event: True, lambda event: False, lambda event: {"ok": True}]],
+        ),
+    )
+    def test_register_filters_via_decorator(self, count, handler, filters):
+        router = Router(use_builtin_filters=False)
+        observer = router.message_handler
+
+        for index in range(count):
+            wrapped_handler = functools.partial(handler, index=index)
+            observer(*filters)(wrapped_handler)
+            registered_handler = observer.handlers[index]
+
+            assert len(observer.handlers) == index + 1
+            assert isinstance(registered_handler, HandlerObject)
+            assert registered_handler.callback == wrapped_handler
+            assert len(registered_handler.filters) == len(filters)
+
+    #
+    @pytest.mark.asyncio
+    async def test_trigger_right_context_in_handlers(self):
+        router = Router(use_builtin_filters=False)
+        observer = router.message_handler
+        observer.register(
+            pipe_handler, lambda event: {"a": 1}, lambda event: False
+        )  # {"a": 1} should not be in result
+        observer.register(pipe_handler, lambda event: {"b": 2})
+
+        results = [result async for result in observer.trigger(42)]
+        assert results == [((42,), {"b": 2})]
diff --git a/tests/test_dispatcher/test_filters/test_command.py b/tests/test_dispatcher/test_filters/test_command.py
index 063bddaa..f312c235 100644
--- a/tests/test_dispatcher/test_filters/test_command.py
+++ b/tests/test_dispatcher/test_filters/test_command.py
@@ -11,6 +11,13 @@ from tests.mocked_bot import MockedBot
 
 
 class TestCommandFilter:
+    def test_convert_to_list(self):
+        cmd = Command(commands="start")
+        assert cmd.commands
+        assert isinstance(cmd.commands, list)
+        assert cmd.commands[0] == "start"
+        assert cmd == Command(commands=["start"])
+
     @pytest.mark.asyncio
     async def test_parse_command(self, bot: MockedBot):
         # TODO: parametrize
diff --git a/tests/test_dispatcher/test_filters/test_content_types.py b/tests/test_dispatcher/test_filters/test_content_types.py
index 8efa5084..f5252323 100644
--- a/tests/test_dispatcher/test_filters/test_content_types.py
+++ b/tests/test_dispatcher/test_filters/test_content_types.py
@@ -1,18 +1,37 @@
+from dataclasses import dataclass
+from typing import cast
+
 import pytest
 from pydantic import ValidationError
 
+from aiogram.api.types import ContentType, Message
 from aiogram.dispatcher.filters import ContentTypesFilter
 
 
+@dataclass
+class MinimalMessage:
+    content_type: str
+
+
 class TestContentTypesFilter:
-    def test_validator_empty(self):
+    @pytest.mark.asyncio
+    async def test_validator_empty(self):
         filter_ = ContentTypesFilter()
-        assert filter_.content_types == ["text"]
+        assert not filter_.content_types
+        await filter_(cast(Message, MinimalMessage(ContentType.TEXT)))
+        assert filter_.content_types == [ContentType.TEXT]
 
     def test_validator_empty_list(self):
         filter_ = ContentTypesFilter(content_types=[])
         assert filter_.content_types == ["text"]
 
+    def test_convert_to_list(self):
+        filter_ = ContentTypesFilter(content_types="text")
+        assert filter_.content_types
+        assert isinstance(filter_.content_types, list)
+        assert filter_.content_types[0] == "text"
+        assert filter_ == ContentTypesFilter(content_types=["text"])
+
     @pytest.mark.parametrize("values", [["text", "photo"], ["sticker"]])
     def test_validator_with_values(self, values):
         filter_ = ContentTypesFilter(content_types=values)
@@ -22,3 +41,19 @@ class TestContentTypesFilter:
     def test_validator_with_bad_values(self, values):
         with pytest.raises(ValidationError):
             ContentTypesFilter(content_types=values)
+
+    @pytest.mark.parametrize(
+        "values,content_type,result",
+        [
+            [[], ContentType.TEXT, True],
+            [[ContentType.TEXT], ContentType.TEXT, True],
+            [[ContentType.PHOTO], ContentType.TEXT, False],
+            [[ContentType.ANY], ContentType.TEXT, True],
+            [[ContentType.TEXT, ContentType.PHOTO, ContentType.DOCUMENT], ContentType.TEXT, True],
+            [[ContentType.ANY, ContentType.PHOTO, ContentType.DOCUMENT], ContentType.TEXT, True],
+        ],
+    )
+    @pytest.mark.asyncio
+    async def test_call(self, values, content_type, result):
+        filter_ = ContentTypesFilter(content_types=values)
+        assert await filter_(cast(Message, MinimalMessage(content_type=content_type))) == result
diff --git a/tests/test_dispatcher/test_filters/test_text.py b/tests/test_dispatcher/test_filters/test_text.py
index df1d26c1..a5f4daaf 100644
--- a/tests/test_dispatcher/test_filters/test_text.py
+++ b/tests/test_dispatcher/test_filters/test_text.py
@@ -1,6 +1,6 @@
 import datetime
 from itertools import permutations
-from typing import Type
+from typing import Sequence, Type
 
 import pytest
 from pydantic import ValidationError
@@ -46,11 +46,11 @@ class TestText:
     @pytest.mark.parametrize(
         "argument", ["text", "text_contains", "text_startswith", "text_endswith"]
     )
-    @pytest.mark.parametrize("input_type", [str, list, tuple, set])
+    @pytest.mark.parametrize("input_type", [str, list, tuple])
     def test_validator_convert_to_list(self, argument: str, input_type: Type):
         text = Text(**{argument: input_type("test")})
         assert hasattr(text, argument)
-        assert isinstance(getattr(text, argument), list)
+        assert isinstance(getattr(text, argument), Sequence)
 
     @pytest.mark.parametrize(
         "argument,ignore_case,input_value,update_type,result",