20oz Straight Skinny Tumbler - Double Walled Vacuum Insulated Stainless Steel Drinking Tumbler with Leak/Spill Resistant Lid - 304 Pro Grade Stainless Steel - This skinny tumbler is Straight Skinny. It is same size at the top and the bottom. 1. Keeps cold up to 24 hours, Keeps hot up to 8 hours. 2. BPA-Free and Phalate-Free.