Connect to almost anything, using the universal connectivity system. The Frontier Pro filter will connect directly to any water bottle with a 28mm opening such as a PlatypusÆ or standard spring 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 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 Cap Strapô keeps the drinking end clean and contamination free.