【Lightweight 12 L Hydration Backpack】: Super lightweight 8.5 oz hydration pack backpack with 2 L water bladder. Waterproof and tear-resistant fabric, PU coated nylon hydration pack bears 25 lbs 【Leakproof & Anti-popping Water Bladder】: Water backpack for hiking with 2 L bladder, BPA-free, food-grade PEVA material, and hose clamp. Leakproof bite value, water flows fast and never drips on when locked 【Comfortable & Breathable & Adjustable】: Multi-adjustable shoulder straps on hydration Pack, adjustable to 19"-34" on should straps, 2.4"-7.9"on chest strap(up & down). Hydration packs are suitable for adults. Ergonomically fits for your shoulders, chest, and waist. Soft air mesh back speeds up the air flow and makes your back cool 【Thoughtful Storage Details】: Running backpack bidirectional main zipper pocket for a water bladder, small storage compartments on front, two small mesh pouches for umbrella, mineral water, BlueTooth stereo, two mesh pouches on the shoulder on phone, and keys 【Multiple Use】: Our hiking backpack with water bladder is suitable for hiking, running, MTB cycling, cycling, climbing, music carnival, and other occasions. This running hydration vest can be a are great companions for families and friends. N NEVO RHINO focuses on outdoor sports backpacks, and vitality blooms from here 【After sale】: If you have any problems, please reach out to us, we will reply within 24hrs. (We provide replacement services for quality problems within 1 year and lifetime customer service)