The designers at Aquamira have come up with the ultimate pump free filter system.ultra-light, compact portable filtration that fits in the palm of your hand. Which is why we say "Dump the Pump!". The Frontier Pro filter will connect directly to any water bottle with a 28mm opening such as a Platypus® 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.