COMPACT LIGHTWEIGHT : This Hydration packs are designed specifically for road cycling, running,and Hiking ,So that's Compact and low-profile so they feel light and stable on your back and wont create a ton of wind resistance ,keep your body functioning at peakNON-SLIP AND BREATHABLE: S-shaped shoulder strap,The shoulder strap is designed with mesh and foam, which has good air permeability. The interior of the shoulder strap is made of foam, which has the characteristics of slowing down, ventilation and comfort, heat insulation, moisture resistance, etc.WEAR-RESISTANT AND WATERPROOF: The nylon fabric is made of wear-resistant, tear-resistant, waterproof nylon material, and the high-density textile fabric greatly improves the wear resistance.LARGE CAPACITY: 12L storage space, reasonable layering can sort your items well,The Daypack is your perfect choice for cycling, camping, running, A decent Holiday Gift for families and friends who love outdoor sports.Material:waterproof nylonSize:42*23*17cmWeight:460gCapacity:12L