The Aquamira Backcountry SRS IV Replacement Filter is designed for adventurers who need reliable water filtration on the go. This ultralight cartridge weighs less than one ounce and significantly enhances your filtration capabilities. It is compatible with Aquamira's Frontier MAX and Shift Bottles, making it a versatile choice for any outdoor enthusiast. With a remarkable 100-gallon rating, this filter effectively removes 99% of viruses, bacteria, and cysts, ensuring you have safe drinking water during your excursions. Whether you're hiking, camping, or preparing for emergencies, this filter is an essential tool for responsible outdoor use.