This bicycle bag is designed with a large opening for easy entry and exit. We are using four adjust rail systems to keep the bag in place. The straps are long enough to snug it down tight against the front tube and under tube. perfect fit your bike frame. Your legs won't touch it at all while ppedalling.With a generous 2.4L capacity, this bag offers ample storage for your cycling essentials.It is suitable for placing small objects such as mobile phones, wallets, keys, and tools; it is fixed by straps, easy to disassemble and assemble; it adopts waterproof zipper to resist rain splashing.Nylon is lightweight and wear-resistant, the overall tear resistance of the fabric can be increased by superimposing cross-mesh yarns.The bottom of the bag has an elastic rope design that can be used to tie small items, and the bag is designed with a fixed position for a portable air pump to avoid mutual friction.The head of the bag is equipped with an independent water pipe outlet, which is compatible with a frame bag water bag, and can also pass through the power bank data cable.Installing it on a frame larger than 54 yards will hardly affect the access to the water bottle .Type: bike under tube bagMaterial: NylonSize: 44cm * 9cm * 13cmColor: White , Black Yellow , BlackWeight: 328gCapacity: 2.4LPacking List:1 * Bag4 * Velcro Strap1 * Cam Buckle BeltNote:All product data are measured manually, the real object should be considered as final. Please understand us. Please check the size of our product and your bike beforehand, lest wasting your time and energy. Waterproof & Durable Use Nylon fabric, the diamond mesh structure of polyester yarns is cross-stacked with each other, and the bottom layer is polyester fabric.The overall tear resistance of the fabric can be increased by superimposing cross-mesh yarns. The middle is the well-knit nylon mesh. Even in the harsh outdoor conditions, this bag can be waterproof and wear-resistant. Large Capacity: With a generous2.4L capacity, this bag offers ample storage for your cycling essentials.You can store the phone mini flashlight,keys, emergency tools, etc.The head of the bag is equipped with an independent water pipe outlet, which is compatible with a frame bag water bag, and can also pass through the power bank data cable. Stable & AntiAttrition: We are using four adjust rail systems to keep the bag in place. The straps are long enough to snug it down tight against the front tube and under tube. They are made of non-slip nylon to reduce friction on the bike tube. Mounting Desing: The bottom of the bag has an elastic rope design that can be used to tie small items, and the bag is designed with a fixed position for a portable air pump to avoid mutual friction. Zipper: YKK waterproof zipper is smoother to open and close, with better waterproofnessand durability. The double-sided zipper compartment design allows for free space adjustment inside the bag, making it more convenient to collect items. The custom large zipper is also easy to operate when wearing winter full-finger gloves. Brand CZMYCBG Model Czmycbg Item Weight 1.54 pounds Manufacturer CZMYCBG Item model number CZMYCBG Package Dimensions 1.18 x 0.79 x 0.39 inches Manufacturer Part Number CZMYCBG