Aquamira Frontier Straw, Emergency Water Filter System, Certified Filtration of 30 Gallons of Water, Black 67109 Pack it light and be ready. The ultralight Frontier Filter Straw is ready to protect you from cysts and chemicals when survival is on the line. The Frontier Filter Straw is certified to EPA and NSF/ANSI standards so you can trust the filter to perform as claimed. Weighing in at a single ounce" it takes up less space than a roll of pennies and doesn't cost much more either. It fits perfectly into pockets and packs. Find a fast moving stream or backcountry water source and you instantly have 30 gallons of life saving water.