Fully Waterproof: Made of Cation polyester with waterproof PVC layer on both sides, this bike pannier is super durable and fully waterproof, as as anti-tear, wear resistant and heat resisting, protecting your items perfectly. Bike Rear Bag capacity: up to 33L capacity, fully expanded to hold more. 33L Capacity: The roll mouth design can expand the capacity according to the number of roll mouths, and put down the items needed for , such as helmets, water bottles, cycling clothes, etc. Bike Rear Rack Pannier Easy installation:Quick release system, easy to be fixed on rear trunk rack and carrying handle for portable. Multi-scene Application: Can be used as a backpack with a built-in computer compartment to meet your needs. Can be used as a shoulder bag to meet commuting needs. It can be used as a bicycle pannier bag, free to switch, suitable for a of bikes. size: 49 x 39 x 29cm : Polyester+PVC colour: grey Package Contents: 1 x bike bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.