West Biking 5 L Outdoor Cycling Climbing Travel Marathon to Hold Water Mini Bicycle Bike Backpack Running Bag 1,The bag size:2.37*5.51*16.9 inch 2,this 5 L bag suit for Outdoor Cycling ,Climbing ,Travel Marathon to Hold Water and Running . 3,Unique designed and come with a west biking key chains. 4,This is a professional cycling, climbing mini backpack made of polyester. 5,Can be used to place the water bags, mobile wallet, bike tools and other small parts.