Lightweight hydration backpack with water bladder pack, which can reduce the load and walk quickly and never be your burden. It is a type of hydration system used as a water backpack for cycling, hiking, camping or a waist pack containing a reservoir or water backpack bladder commonly made of rubber or flexible plastic. The best hydration backpack with a hydration system allows you to drink water effortlessly without taking off your pack. The hydration backpack manufacturers tell you that the reservoir contains a capped mouth for filling with liquid and a hose that allows the user to drink hands-free. Most of the hoses end with a "bite valve" that opens when the user bites down on it. Several hydration backpacks are insulated to keep water freezing or warm.