The HumanGear capCAP is a civilized 2 in 1 cap for Nalgene, Camelbak, and other wide mouth bottles. The capCAP is the best of both worlds. Drink spill free through the small spout, and clean and fill with ease with the large cap. Just screw in the larger cap and you're ready to go. It's splash free and easy to clean. Lets you add chunky ice, lemons or whatever. The rubberized small part of the cap covers an ergonomic drinking spout for splash free swigs. Fits Nalgene, Camelbak and other wide mouth water bottles. Spill and splash free drinking through the small spout. Clean and fill with ease through the large cap. 100% polycarbonate free. 100% BPA free. Made of FDA approved food safe polypropylene 5 plastic.