Upgrade your favorite 40oz. tumbler with Cirkul! The 40oz. All-Day StrawSip Adapter Lid and Sugar-Free Drink Mix combination is designed for hydration enthusiasts who love convenience, personalization, and flavor! Turn popular 40oz. tumblers with a 3.5” diameter opening into a tumbler with great taste. The StrawSip Lid features a built-in leak-resistant straw and cartridge system, making it easier than ever to sip your favorite flavors while on the move. Compatible with Cirkul Sip flavor cartridges (sold separately), this innovative lid allows you to customize your water with delicious flavors anytime, anywhere. Featured Flavors: Frosted Pink Refresher: Amp up your day with the refreshing sweetness of strawberry and acai blended with a creamy twist of coconut. Add water, ice, and sip away then slip away to your own fruity oasis. LifeSip Fruit Punch: Fruit punch is a classic. A little citrus. A little sweetness. It's like the classic rock of flavors; the perfect blend of fruity notes that just works.