A Kuyou hydration pack is a backpack with a built-in water bladder. They are popular among hikers, runners, and cyclists as they allow you to drink hands-free. Here’s a quick guide on how to use one: 1. Fill the bladder with water – You can do this using a hose or by pouring water directly from a tap. Be sure to screw the lid on tightly before inserting it into the backpack. 2. Attach the drinking tube – The drinking tube should be attached to the bladder before putting it into the backpack. This will allow you to easily access it when you’re ready to drink. 3. Wear the backpack – Put on the backpack like you would any other backpack, adjusting the straps until it feels snug and comfortable. 4. When you're ready to drink, bite down on the valve and suck the water through the straw into your mouth. 5. Drink regularly throughout the day, even if you don't feel thirsty. It's important to stay ahead of your thirst and not let yourself get dehydrated.