SMALL & PORTABLE: The bike seat bag designed with only 0.4L capacity and looks like an oval egg, Internal layered net can classified storage more items and make it meet the needs of your daily riding, you can put some small items: tire tools, Mini/ Co2 pump, light, Tube, Key, Energy Gel and so on.Only 110g,Don't worry that the seat bag will add any burden to your riding. DURABLE HARD SHEEL: Made of high quality Polyester +PU material, the surface of the saddle bag Available in carbon or solid colors which feels textured and lustrous. Not only is it very durable and very tough and stylish,protects the contents of the bike bag very well. Moreover, smooth surface makes the bike seat bag easy to clean. MORE SECURE BUCKLE INSTALL: The quick release clip of the bicycle saddle bag not only provides excellent stability but also ensure the bike bag can be removed and install in seconds.It's durable, not as easy to break as straps.Besides, the cycling pouch come with an adjustable elastic strap, more secure and stable. WATER-RESISTANT & TAILLIGHT COMPATIBLE: The surface of the bike accessories bag made of waterproof PU.The pressure glue waterproof zipper design, so that you can use it even in rainy days.In addition,There is a taillight hook on the back of the bicycle storage bag for hanging taillight (TAILLIGHT NOT INCLUDED).Reflective logos on the bag hook which make cycling safer at night