Designed to work with Nalgene, CamelBak and other popular drinking bottles (including stainless steel), the capCAP turns your wide-mouth bottle into something a lot easier to drink from. This new version also has a "CapKeeper" that holds the small cap back while you're taking a drink. 100% BPA-free, polycarbonate-free and phthalate-free. 

Note: bottle not included.