I am selling a lightly used MSR Autoflow Gravity water filter plus a new unused replacement Autoflow Gravity water filter for $75 + Shipping. I used the water filter system on two 7 day solo trips to the Lac La Croix area and estimate I filtered around 140 Liters with the filter. According to MSR each filter can clean 1500 Liters of water. The reservoir bag has some light areas of pine sap where it was hung in a tree but it is free from any hole or punctures. The used filter cartridge has a date stamp of 030220 while the new unused filter cartridge is stamped 101121 (see picture 4). I have included links from the MSR website with specs and information regarding the filters. MSR upgraded the water bag to a larger size but the Autoflow filters are unchanged.

MSR Autoflow Gravity Filter

MSR Autoflow Gravity Replacement Filter