Refresh2go Personal Water Filter Straw, Black PORTABLE WATER FILTER: Drink safer, cleaner water anywhere. 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! STYLISH DESIGN: Comes in a black and white candy stripe design.