Cirkul 40oz All-Day StrawSip Double-Wall Insulated Stainless Steel Tumbler with Handle, along with two flavor cartridges. This tumbler uses StrawSip technology, allowing you to sip through a straw while flavoring your water with a Cirkul flavor cartridge.  Here are some key features: StrawSip Technology: Allows you to enjoy Cirkul flavors with a straw.  Flavor Customization: The flavor mixes as you drink, letting you switch between regular and flavored water. The flavor intensity can be adjusted with a dial.  Double-Wall Insulation: Keeps drinks cold for extended periods.  Spill-Resistant Lid: The lid is durable and spill-resistant.  Comfort-Grip Handle: Provides an ergonomic handle for easy carrying.  Reusable Straw: The tumbler includes a reusable inner straw.  BPA-Free: The tumbler is made of BPA-free stainless steel.  Multiple Colors: Available in various colors, including Midnight Blue, Cherry Blossom, Rose Gold, and Chameleon.  The Cirkul system aims to make drinking water more delicious and personalized. The tumbler is easy to use: fill it with water, attach the lid, insert a flavor cartridge, and adjust the flavor dial.