Lightweight Hydration Backpack, Running Pack with 2L Water Bladder, Hydro Water Daypack for Cycling Hiking Rave for Men Women 100% Nylon Imported Lightweight 12L Hydration Backpack: Super lightweight 8.5 oz hydration pack backpack with a 2L water bladder. Waterproof and durable fabric, PU-coated nylon hydration pack carries up to 25 lbs. Leak-Proof & Anti-Popping Water Bladder: Hiking water backpack with a 2L bladder, BPA-free, food-grade PEVA material, and hose clip. Leak-proof bite valve, water flows quickly and never drips when locked. Comfortable & Breathable & Adjustable: Multi-adjustable shoulder straps on the hydration pack, adjustable from 19"-34" on shoulder straps, 2.4"-7.9" on chest strap (up & down). Hydration pack is suitable for adults. Ergonomically fits your shoulders, chest, and waist. Soft air mesh on the back speeds up airflow, keeping your back cool. Thoughtful Storage Details: Running backpack features a dual-way zipper main pocket for a water bladder, small storage compartments in the front, two small mesh pockets for umbrellas, mineral water, Bluetooth stereo, and two mesh pockets on the shoulder for your phone and keys. Multiple Uses: Our hiking backpack with a water bladder is suitable for hiking, running, MTB cycling, biking, climbing, music festivals, and other occasions. This running hydration vest can be a great companion for families and friends.