Klean Kanteens leakproof Cafe Cap 2.0 wont leak or spilland turns any Insulated Wide product into an instant to-go mug. Throw it in your bag or stash it on your bike, now its even easier to Bring Your Own hot or cold drinks anywhere you go. Made from BPA-free polypropylene and food-grade silicone, this cap is safe for use with acidic or hot beverages. Compatible with Wide Klean Kanteens only.