Double Wall Insulation: Keeps beverages at ideal temperatures for hours Leakproof Lid: The straw lid offers a tight seal to prevent spills and leaks. This product comes with a fitted straw that locks into the lid and was designed specifically for this vessel. It also comes with a clear straw used in other Simple Modern products. The straw lid is not recommended for hot or carbonated beverages BPA-Free & Dishwasher Safe The 24oz Mesa fits in most cupholders. The 34oz Mesa does not fit in most cupholders.