Designed for coffee and tea loving backpackers, the GSI Outdoors H2JO fits most wide mouth 32 oz. water bottles and delivers a hot cup of your favorite brew. Fill your water bottle with hot water, screw the H2JO! into place, add coffee grounds or tea leaves to the integrated filter, close the lid of your bottle over the threaded top of the H2JO! and, presto, you've got a hot cup of backcountry coffee or tea!