Re-usable coffee/tea filter built to withstand life in a rucksack.
MSR says: A low-profile, reusable coffee or tea filter that can be stored in just about any mug or cup.
Eco-friendly: Reusable filter rinses out easily and saves on paper filer waste
Compact: Nests inside most mugs or cups
Ultralight: Only adds an extra ounce to your pack