The Corkcicle Commuter Cup in 17 ounce Walnut is the perfect cup for those on the go. They’re made from insulated stainless steel and have a slim design. This slim look fits nearly all bicycle cages and vehicle cup holders. Corkcicle Commuter Cup in Walnut includes a spill-proof 360° Sip Lid. No matter where you go on it, you don’t have to find where the hole is to drink from while you’re focused elsewhere. Your Commuter Cup will keep your beverages hot for up to 5 hours or cold for up to 18 hours. The inside is ceramic-coated, not stainless-steel, so you only taste the drink you brought. These are the perfect travel companion for everyone!