Rambler Straw Lids have a molded-in stopper that holds your straw safely in place, are shatter-resistant, dishwasher-safe, and completely free of BPA. Please note: This product is not compatible with the Rambler 20 or 30 oz. Travel Mug with Stronghold Lid. Please note: Do not use the Rambler Tumbler Straw Lid with hot beverages.