ezyoutdoor 2 pcs 2.5L Hydration Backpack Water Rucksack Bladder Bag Running Hiking Cycling Free TPU Hydration Bladder,BPA Free Tasteless Water Bag, Most Health Cycling, Climbing, Hiking High-flow bite valve with dust cover. mouthpiece with a valve switch, to prevent leakage.3.5 inch openings-- Large opening for easy cleaning and easily adding ice. Durable Bite Valve for easy drinking.High smooth interior surface. The smoothness of the liner prevents the germ and the lime from adhension,which promotes health. Can be used to store water with -20 to 50 degree ;Compressive resistance to abrasion Safe non-toxic TPU material;Can be put into backpack and backpack's shoulder strap;Tube connected to the bottom of the bladder. Package included:2 x Water Bladder;Lifetime warranty;7-15 business days delivery date with tracking number