Ultimate survival filter that blocks chemicals, heavy metals, bacteria, and viruses. Can be used in the following configurations: inline with a hydration backpack, as a straw, with a gravity system, threaded onto a water bottle, and more. Includes: MUV1 activated carbon fiber filter, MUV2 hollow fiber filter, MUV3 Nanalum filter, pre-filter pre+28 assembly, pre-filter felts, out+28 assembly, mouthpiece cap, hose adapter, hose (blue/clean water 45cm), hose clamp, and bucket adapter. Boxed with hanging tab.