A small, lightweight replacement cartridge for the MSR AutoFlow Gravity Filter. Because the filter uses Hollow Fiber Technology, where fibers are somewhat more brittle than traditional filter materials, it's recommended to pack a spare cartridge on longer trips. This is not compatible with the MSR HyperFlow Microfilter.Dimenstions: 1.5 in x 5.75 in (3.8 cm x 14.6 cm)Wt. 13.8 oz (392 g)Hollow fiber filters to .2 micronReplacement cartridge for MSR Autoflow filternot compatible with the MSR HyperFlow Microfilter