The designers at Aquimira have come up with the ultimate pump free filter system, that is small compact, easy to use, and will compete with the "big boys." This unit was designed and packaged specifically for the military. The Frontier Pro will connect to almost anything, using the universal connectivity system. It will connect directly to any water bottle with a 28mm opening such a the standard water bottle. Using the tube connection feature you can connect to the drink tube of your hydration system. or drink from any open container or water source. Since you can drink directly from the unit there is no chance of confusing inlet and outlet tubes resulting in possible cross contamination. The Frontier Pro can also be set up in a "gravity flow" mode to filter water unattended while you pursue other activities. The patented Bite Me valve provides drip free easy drinking and the integrated cap and Cap Strap™ keeps the drinking end clean and contamination free. The Frontier Pro filter is tested to remove 99.9% of Giardia and Cryptosporidium. Activated Coconut Shell Carbon reduces waterborne chemicals, improves taste and eliminates offensive odors. Miraguard™ antimicrobial technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media. This Olive Drab unit comes specially packaged in a very robust 5 mil. gusseted , zip closure bag. The top portion of the bag must be torn off for initial opening. The unit can then be secured in the bag using the zip closure.