The RapidPureA(R) Purifier+ Multi-Use System is a 4-way multifunctional system that uses our innovative POD platform for purification YOUR way. The POD platform adapts to your adventure, using UltraCeramA(R) and OpenPore technology for protection against viruses, bacteria, parasites, and more. Four Ways to Use:BOTTLE: Connect to your own 28mm bottle, or use the included soft bottleSTRAW: Drink directly through the POD with the included emergency strawGRAVITY: Create your own lightweight gravity system by hanging upside downINLINE: Connect to your hydration pack and filter water as you drink