Filter and Drink Water From ANY Container! 2 Refresh H2Go Universal Filter Straws SPILL AND LEAK RESISTANT: It prevents spills and leaks when not in use. WORKS WITH ANY CONTAINER: Whether it is your favorite cup, tumbler, glass, or bowl. TREATS LARGE AMOUNT OF WATER: Treats up to 40 gallons of water. EASY TO USE: Just put it in water, sip, and let the straw do all the magic! Each Filter Treats 40 Gallons of Water