humangear Unisex/'s CAPCAP 2.0 BLACK/GRAY, One size

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 ... - Manufacturers part numbers: 340472|HG0525

• Compatible with certain double-wall stainless steel bottles, such as those from Hydroflask and Camelbak.
• Includes silicone gaskets in both the small and large cap for extra leakproofness
• The CapKeeper tab holds the small cap out of the way when drinking.
• They have also redesigned the cap-bottle interface so that the cap Cap is now compatible with popular stainless steel water bottles from Hydro flask, kleankanteen, and others