The Civilized Cap - humangear capCAP+ is a 2-in-1 cap that turns wide-mouth openings into a comfortable drinking spout Compatibly Made - Designed to work with most popular wide-mouth drinking bottles like Hydroflask, Camelbak, Nalgene, and more Secure, Easy Open - Rubberized grips make for an easy twist open even with gloves on, while the CapKeeper notch holds the small cap in place while you drink Responsibly Made - Drink to your health! We use FDA food-safe material that is BPA-free, PC-free, and Phthalate-free Design Made to Last - Since 2007, humangear believes design comes from empathizing with those who seek what's reliable, multi-functional, and sustainable. We're passionate about creating evolved products to help humans and the planet, too The Humangear 63mm Universal capCAP+ is a 2-in-1 cap that turns wide-mouth openings into a comfortable drinking spout. Its wide compatibility fits Hydroflask, CamelBak, Nalgene, and other popular wide mouth bottles (sold separately). It is BPA, PC, and Phthalate-free as well as top-rack dishwasher safe. Features: Rubberized grips make it easy to twist open. CapKeeper notch holds the small cap in place while you drink.