capCAP is the civilized 2-in-1 accessory cap designed to work with Nalgene, CamelBak, and most other popular wide-mouth drinking bottles. The new, re-designed capCAP+ is also compatible with Hydro Flask wide-mouth, Nalgene Stainless, and Guyot Stainless.Most wide-mouth bottles are easy to fill and clean, but the standard opening is too big to drink from without spilling. Narrow-mouth bottles are great to drink from but you can forget about putting ice cubes in them, let alone cleaning them. And bottle inserts don’t really fix a spout that was never meant for daily drinking.capCAP offers the best of both worlds. Drink spill-free through the small spout, and then clean and fill easily with the large cap. Don’t forget that the wide, rounded strap is more comfortable to hold too.The new capCAP+ has a few additional cool features like the CapKeeper that holds the small cap out of the way when drinking and rubberized grips on the small cap.The capCAP+ is 100% BPA-free, polycarbonate-free, and phthalate-free, and both caps are made with FDA-approved, food-safe polypropylene (#5) plastic. Both small and large cap gaskets are made from food-safe silicone.See images for compatibility chart.