The Stanley Aerolight™ Transit Mug | 0.47L Black 2.0 is built for your commute and active lifestyle. Part of our Transit collection, this mug is lightweight yet maintains desired liquid temperature for up to 6 hours hot and 8 hours cold. With a leakproof, drink-through lid, you don't have to worry about spills as you go. Plus, it's dishwasher safe and BPA free for easy cleaning. A true commuter-friendly mug, the AeroLight™ is 33% lighter than our standard stainless-steel metal drinkware.