Hydration Backpack 3L Water Bladder, Hiking Water Backpack with Rain Cover, Insulation Hydration Daypack Rucksack for Cycling

Far from Stuffy - Ergonomic: The hydration backpack is lightweight and breathable, with breathable mesh padding added to the shoulder straps, waist pack, and back area; A concave and convex design on the back of the water backpack, leaving a heat dissipation channel to accelerate heat dissipation and keep your back cool and not sweltering to ensure comfort during exercise High Flow Bite - Valve: Water backpack for hiking size is L 12'' * W 5.9'' * H 18.9''. Overall capacity is 20 L & 3 L water bladder, which is made of PEVA material, BPA-free. kink-free insulated straw and dustproof high-flow bite valve; Mouthpiece doesn’t leak, water flows fast and won't drip on your shoulder when locked Separate Insulated Compartment: Our insulated hydration backpack exclusive insulated layer of the water bladder keeps your liquids cold for 5 to 7 hours and prevents the bladder from sweating out. Remove the water bladder compartment, it is a normal daypack, suitable for cycling, hiking