Check the listing for details. Water Filter Straw Portable Purification Filtration System Gravity Fed Bag 3L. Condition: New. Listed at 16.70 USD. Experience safe drinking water anywhere with the Shurex Blue water filter bottle, a must-have for outdoor enthusiasts and emergency preparedness. Its gravity-fed design ensures a reliable and convenient water purification solution for camping, hiking, travel, and survival adventures. The integrated UF membrane filtration technology effectively removes impurities, providing you with clean water on the go. In addition to the portable water filter bottle, this set includes a filter replacement designed to fit most water bottles, ensuring a versatile and sustainable hydration experience. Whether you're backpacking through the wilderness or facing an emergency, this filtration system is your dependable companion for accessing safe, pure water.