Zipper closure THE MOST COMPLETE HYDRATION PACK available. Our ALL-INCLUSIVE Hydro hiking backpack comes with the best quality 2L hydration bladder and cooler bag, made of most durable, flexible TPU material TOP QUALITY - WELL THOUGHT OUT DESIGN. Our hydration pack is made of high quality, durable and waterproof Ripstop material & best-quality zippers. Lightweight and comfortable with lots of pockets. The Air Flow system prevents sweating & provides comfort. Very functional and easy to use FULLY ADJUSTABLE to any body size. This hydration backpack camelback with a dedicated hydro compartment is suitable for men, women and kids! The high reflective elements built-in will perfectly ensure your visibility & safety at day or night HIGH-QUALITY ALL-IN-ONE hydration accessory gear kit. Will keep your drink cool for up to 5 hours Perfect for day hiking, running, biking, cycling, MTB, skiing, snowboarding, trail walking, training, motorcycling, dirt bike, rave, concerts... Definitely worth having THIS DURABLE INSULATED HYDRATION PACK - water backpack is built to last. You will use it for a long time without worries. Tested and proven in practice - you'll enjoy using it!