Camelbak packs are high quality, but I hate their hydration bladder. It collapses flat and is difficult to clean and dry. The Platypus bladders expand like an envelope, and they can be free-standing.

TWO GALLONS OF WATER PER PERSON PER day gets heavy (a gallon weighs eight pounds), not to mention bulky. How to carry all that liquid? We have a few ideas. Backpacking. Because staving off dehydration ...