Large Capacity：large enough to store bike tools, bike tire pump, cable lock, clothes, wallet, phones, power bank, towels, water bottles, maps, food, etc. This under seat storage bag includes a 35L main compartment,  The top elastic drawstring can also help you tie a lot of items,like bike pump, umbrella, clothes,etc

WATER RESISTANT: bike trunk bag made of carbon composite leather which is strong water resistant and durable.

FOLDABLE CAPACITY: Large capacity bicycle bags rear rack can be unfolded with zippers to a bike pannier when you need more capacity.

MULTIFUNCTION: Delicate bike bags come with 2 shoulder straps can use as a messenger bag. Portable design convenience your travel life.

THICKEN PAD REDUCING SHOCK: Padded inside reducing shock while cycling. Detachable partition for usage flexibility.

INTERATED BODY FRAME: Hard to deflective during use. Protect clothes, shoes, phone, clothes, shoes, phone, cameras, kettle and other belongs into the bike trunk bag confidently.