I'm not entirely sure that I like the idea of the filter being stored exposed and unsealed on the outside of the container when not in use. Having a cruddied-up filter from months of storage sounds like a failure waiting to happen. Maybe it works better than I think. I'd need a real-world test to be sure.
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“Hiking is just walking where it’s okay to pee. Sometimes old people hike by mistake.” — Demitri Martin