Just to be clear for people who may be looking for an actual purifier, the Sawyer Squeeze mini (and original) as well as the Katadyn BeFree are not purifiers but rather just filters. They are both great but they will not purify your water. Water filters and water purifiers are not synonymous.

The MSR Guardian is an excellent water purifier if you don’t want chemical treatments or will be using cloudy water where a UV filter isn’t trustworthy.