MOUNTAINTOP Running Backpack Hydration Pack for Hiking Cycling Climbing Womens & Men - with Multiple Storage Compartment HYDRATION SYSTEM COMPATIBLE- Easy access compartment at the back to keep you hydrated all day. And the tube management system enables you to drink on the move .Suitable for 1.5 liters hydration bladder. (Hydration bladder not included) BEARING SYSTEM- Padded and breathable mesh back panel and shoulder straps offer cushioned comfort, while also promoting air circulation along your back and shoulders.Keep your back and shoulders cool and comfortable. STERNUM STRAP- Balance your shoulder straps and adjust it for perfect fit. YKK Zipper Open and close smoothly with each pull. ADJUSTABLE HIP BELT- The zippered pockets on each side of the hip belt allow quick and easy access to smaller items like phone, power bars, map,GPS.. VERSATILE- Ultra-light Running Backpack. Perfect for Running, Biking, Race, Climbing, Cycling, Walking, Jogging, Canoeing, Hiking and so much more.