Breathable and AdjustableThe running backpack is equipped with soft and breathable mesh shoulder straps for optimal comfort, effectively absorbing sweat, keeping air flowing, preventing discomfort caused by heat buildup, providing excellent air circulation and breathability, and keeping your back cool. Our adjustable shoulder straps fit most body types for men and women.Lightweight and Reflective StripsThis ultra-light running backpack is equipped with wide and breathable shoulder straps to effectively distribute weight and reduce energy consumption. It is lighter than traditional backpacks. The hydration backpack is designed with reflective details to ensure safety at night. It is perfect for day hiking, cycling, running, or riding.Large CapacityThe running backpack is large enough to hold most daily necessities such as laptops, tablets, wallets, books, mobile phones, water bottles, umbrellas, etc. Our hiking hydration pack can easily store all your essential gear. Easily organize your items in the hydration pack and have everything within reach. Make your journey more convenient.Suitable for SportsThe waterproof and sturdy hydration pack is perfect for running, marathon, hiking, mountaineering, cycling, and more outdoor activities. It is an ideal choice for men and women. It will not move or bounce (there are sticky stickers inside to secure the hydration pack). It is a great gift for friends and family who love outdoor sports.