One of the most popular sizes is the 20oz tumbler, it has a double wall, stainless steel, and is vacuum sealed, The tumbler is made of the highest quality material keeping drinks cold and hot for up to 12 hours. It is BPA-FREE. It has a multifunctional lid that is ideal for cold and hot beverages. Once you use one of these, you will never go back to drinking out of anything else. Product Features BPA FREE✓ Straw ✓ Two functions✓ Use hot or cold ✓ Non-slip base ✓ Stainless Steel ✓ Gloss Finish ✓ Double wall✓ Vacuum insulation✓ Shopify Store https://yellowbeecreations.myshopify.com/ Etsy Store https://travalmugsandpurses.etsy.com There is no return or exchange on this item as it is made to order, please allow 1 - 2 weeks for the item to be shipped if there is a high volume of orders. If you have any questions please feel free to email me.