These portable 4-stage water filter straws provide a compact, practical solution for obtaining cleaner drinking water from natural sources and compatible containers. Each straw combines a 0.1 micron hollow-fiber ultrafiltration membrane, activated carbon fiber, and double PP cotton to remove impurities and improve taste, making it suitable for lakes, streams, rain, and snow water. Designed for outdoor and emergency use, the filters deliver a high capacity—up to 5,000 liters—at an approximate flow rate of 500 ml per minute. The versatile 3-in-1 design lets you drink directly from a water source, attach the straw to a water hose, or screw it onto standard bottles including Smartwater, Cnoc bags, and soda bottles. At 8.4 inches long and made with ABS and membrane components, each straw is ultra-compact and easy to carry in a pocket, backpack, or survival kit. This pack includes six blue water filter straws and six silicone extension tubes. Only the listed package contents are included; other products shown are not included.