Hydration Pack Backpack - GRESAHOM Outdoor Hydration Backpack with 2L/70 Oz Water Bladder - Rucksack Bladder Bag for Cycling Running Hiking Camping - Best for Men Women Kids FITS PERFECTLY: This hydration backpack has two adjustable shoulder straps, with chest straps and will fit most sizes from kids to adults. The chest strap will insure it is held securely and prevent any movement from the pack, while walking. HIGH STORAGE VOLUME: The backpack has storage compartments that fit your clothes, phones, keys, foods, and other outdoor sport gear. The outer mesh pocket with bungee cord surrounded can store gear for daily use. The main pocket will be used to hold the water bladder and valuable items, such as phones or keys. WATER RESISTANT AND DURABLE: The main compartment is covered with premium "Rip Stop Nylon" material. With that material, it will keep your inner belongings dry during light/medium rain. It's also durable, by reducing wear and tear of the pack and will last much longer. REPLACEABLE 2L/70 Ounces BLADDER: Has a 2L/70 ounces Food-Grade, BPA Free, bladder which will keep you hydrated. The BPA free bladder is also well insulated and ensures the liquid will stay fairly cool and will not leak. No WORRY GUARANTEE: We offer immediately 100% money back guarantee if you are not satisfied with our products - no question asked. So get one from us without hesitation now! We aim to please and offer the best customer support.