Gear Review: Katadyn Base Camp Gravity Filter

Filter water for a group with this big bladder.

“It’s like having a tap in camp,” one tester says of the Katadyn Base Camp Gravity Filter. He simply filled the 2.6-gallon bladder with river water, hung it on a tree limb, and aimed the outlet tube into his bottle. Gravity draws the untreated water through the pleated cartridge. It’s perfect for groups of four or more. $70; 17 oz.;