ArcEnCiel Waterproof Mountain Bike Bag Cycling Bicycle Accessories Good waterproof materialMade of thick PVC net clamping cloth to make sure that it is air-proof and impermeable , also durable . The PVC net clamping cloth is widely applied to waterproof outdoor rafting bag , fishery culture , etc. New design of the bag sealBy foldable seal without zipper to prevent water or rain from entering the bag , also it's easy to rub it dry . Excellent air-tightness and safe to storage belongings Excellent waterproof & air-proofAdopted High frequency welding technology to make bag edges could be sealed well , fine workmanship and durability Lightweight & adjustable volumeStorage space (2-3L) is free accroding to your belongings , easy to install and won't be a burden when riding Excellent design and safe for youReflective stickers on the both sides of the bag , give you a safer ride at night . Good gift and stuff for you and your friends