Big for adventures and brewpubs. Our 64oz (1.9L) Kewler Opener Bottle keeps H2O iced up to 72 hours, beer cold up to 32 hours and hot drinks hot up to 20. Topped with our patented and insulated Bottle Opener Cap, it opens beer bottles on the fly thanks to an integrated church key. It's also easy to transport thanks to a bottle leash with room for a two-finger carry. Prost!