Hydration backpack

From Trail-Finder -- Dedicated to getting you outside

Hydration backpacks were originally introduced by CamalBak for hiking and mountain biking, and have now largely taken over the backpack market. They and are the most common type of hydration pack on the market today, and the most common type of pack, in general. By combining an integrated water bottle with a pack, it's easier to carry more water, making dehydration less likely, and making your outdoor activities more enjoyable.