"Enjoy quick and easy filtered water when you need it with the MSR Platypus GravityWorks 4L Water Filter System. Designed to provide up to 4L of filtered water in just 2.5 minutes without any cumbersome pumping, this lightweight system utilizes gravity to deliver safe water for several people. This lightweight 10.75-oz. system includes a capable filter that meets all EPA and NSF guidelines for the removal of bacteria and protozoa, including giardia, cryptosporidium, E. coli, salmonella, and cholera. The dual-bag system also doubles as a handy water transport solution, carrying up to 8L. Made of Platypus' taste- and BPA-free food-grade liners, the GravityWorks' 2 bags feature Platy zip opening for easy filling/emptying. The system's hollow-fiber filter traps particles down to .2 microns and backflushes in just 4 seconds for easy maintenance. 9.5""L x 3.25""W bags. Filters up to 1,500L per filter.Manufacturer model #: 14240. Easy-to-use, pump-free water filtration system 4L of filtered water in just 2.5 minutes 2 taste- and BPA-free food grade liners Hollow fiber filter traps particles down to .2 microns Meets all EPA and NSF guidelines for the removal of bacteria and protozoa Doubles as a water transport solution: holds up to 8L"