One Sweet Purifier
I've had my Sweetwater filter for about 5 years now and I have filtered plenty of water with this beauty. It is a "must-have" in my pack. I really like the double action pump (pumps on the up and down stroke). There are other systems that are smaller but they filter slower (I prefer not spending all day pumping water). When you get home from your trip, put the filter canister in the freezer to prevent mold and to kill any bacteria.