The Sawyer Products Mini Water Filtration System Filter SP128 is a compact and portable water filter designed for survival and prepper situations. With a filtration technology utilizing a Hollow Fiber Membrane, this filter is capable of providing clean drinking water for up to 100,000 gallons. Made in the United States by Sawyer, a trusted brand in water filtration, this straw filter in blue color is perfect for camping, hiking, and other outdoor activities where access to clean water may be limited.