Hydration
A hydration pack is a specially designed backpack or waist pack that can carry a bladder full of fluid. This bladder e. the water reservoir is connected to a hose, which usually comes over the shoulder near the mouth for easy access to water. You can easily quench your thirst by sipping from the hose valve.
The main task of a hydration bag is to carry a liquid reserve, but most of them come with the option to add more equipment. The level of storage for other essentials (such as food, tools and phones) varies, and you should choose the bag that best suits your needs.
Although backpacks with water reserves do not have the same sizing as clothing, you should still choose a suitable bag according to your body size. Shoulder and waist straps and back length vary by capacity.