TRIWONDER Hydration Pack Backpack 5L Lightweight Deluxe Marathoner Running Race Hydration Vest Nylon + Polyester Net Imported THIS VERSION IS HYDRATION VEST ONLY, NOT INCLUDED WATER BLADDER OR WATER BOTTLES BREATHABLE + ADJUSTABLE -- Soft and thin mesh padding of hydration vest for optimal comfort and absorb sweat efficiently. The flexible adjustable straps help race vest hug your body nicely LIGHTWEIGHT -- Ultralight hydration pack with wide and breathable shoulder straps distribute weight effectively, reduces strength consumption. The cycling backpack provide you with the max support and min burden SUPER POCKET -- You can carry everything you need with the water backpack. Super pocket design that your water bottle, phone, keys, foods can easily stored in the front pack pockets, and bladder or other items can be held in the back one EXTENSIVE APPLICATIONS -- The waterproof and sturdy running water vest aims to accompany your trip of Jogging, Running, Marathon, Hiking, Climbing, Cycling, Walking, Backpacking, etc. Triwonder hydration backpack is always be there for you Air mesh back and shoulder pad, breathable and relieve sweat effectively. 5L Good Volume race vest with 190g, make your movement more flexible and smooth. Main  warehouse - pack 1.5L water bladder. Zipper warehouse - can accommodate phone under 6in or keys. Kettle warehouse - fit for you water bottles. Adjustable strap help hydration backpack hug your body freely. Smooth and anti-rust pack zipper. Superfine flannelette wrapping.