Hop over to Amazon and get a deal on Contigo Streeterville Steel Vacuum Insulated 40oz Tumbler. This is fully leak-proof so you can stay hydrated without the mess while on the move. With double-wall stainless steel vacuum insulation, it keeps drinks cold for up to 29 hours, helping you keep cool when the heat just … Continue reading Contigo Streeterville Steel Vacuum Insulated 40-oz Tumbler $20.99 (Reg. $35) – 5 Colors, Stays Cold for 29 Hours