OutdoorsmanLab Bike backpack For Running, Hiking, Biking - Ultralight Compact Backpack Fits Up To 38" Chest/Waist - Front/Side Pockets, Adjustable Chest & Shoulder Strap FIT CHEST & WAIST UP TO 38": This pack has a tight fit, might be small for men with wide chest and/or waist, but should fit women and kids great. Adjustable shoulder & chest make sure it doesn't bounce when you run or bike. STAY HYDRATED w/ 70oz / 2L BPA-free water bladder w/ extra large opening and premium mouthpiece STAY DRY AND ABSORB SHOCK: Double breathable mesh (backside) ensures you stay dry even on a hot day. EVERYTHING WITH REACH (instantly) w/ 2 back pockets, 2 stretchable side pockets, and front pockets STAY SAFE & VISIBLE w/ multiple reflectors throughout the backpack.