For All Activities: The hydration pack is small and easy to carry. It will be the best hiking accessories for your hiking, cycling, mountain climbing, trail running, and other outdoor sports. Leakproof and Strong Pressure Resistance: The release tube is detachable. It adopts double-layer crimping process design, providing a full range of leakage protection. Well-sealed Water Bladder: Hydration pack bite valve offers fast, smooth water flow with a on/off switch, easy access without having to dig down into a pack to attach or detach the drink tube. Easier to Open and Close: Our hydration bag tops feature extra wide openings and a unique sliding top that seals against water and provides wide access for easy filling and cleaning. Safe TPU Hydration Bladder: The 3L water bladder is made of TPU, taste-free, BPA-free, BPS-free, and phthalate-free. It is also able to withstand temperatures from -20 to -50 degrees Celsius. L 16.5'' x W 7.87'' hydration bladder is compatible with most hydration packs.