*Bottles not included. Fits 32oz/48oz Wide Mouth and OTF bottles 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.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.capCAP+ is 100% BPA-free, polycarbonate-free, and phthalate-free. Both caps are made with FDA-approved, food-safe polypropylene (#5) plastic. It is also covered by our lifetime warranty.