INOXTO Hydration Pack Backpack，Insulated Hydration Pack 。? HOT ITEM ? ?[Breathable Mesh Shoulder Straps]: Equipped with the ventilated mesh shoulder straps on this water backpack for air circulation, keeping you cool and preventing discomfort due to accumulated heat. This adjustable shoulder strap is made of silica gel, which is more comfortable to wear than cotton. Minimize pressure with its ergonomic design. This running hydration vest is lightweight enough to make it comfortable when running, hiking, cycling, biking, riding or marathon training ?[Leak-proof & Wide Opening]: The upgraded opening design of the internal bladder is fully leak-proof and keeps easy filling and cleaning. You must hear a \"click\" sound to ensure the water hose is securely installed ?[2L Large Hydration Bladder]: Includes a food-grade, BPA-free and odorless water bladder. Leak-proof performance is good with its thickened design ?[Insulated Bladder Bag]: You can put the ice pack into this insulated hydration bladder pocket to keep water cold for 4 hours, making you enjoy cold drink on the go ?[Ample Space]: This hydropack features 3 pockets like a water bladder pocket, a front zipper pocket and a main pocket for storing hydration bladder, towels, clothes, snacks, sunglasses, phone, keys. With the elastic cord, more hiking gear can be attached This water backpack is equipped with breathable mesh shoulder straps for air circulation, keeping you cool while running, cycling, hiking. A 2L hydration bladder is included in this running