.Want to keep it hot all day, here's the deal. The Jumbe Stainless Steel Tea Mug Flask. This flask has been crafted out of stainless steel to offer the best insulation and most importantly, for durability as it is unbreakable. It can be your great day-to-day companion as it keeps your drinks hot for hours. You can now order for this Tea Mug flask on Jambo and have it delivered to you at an amazing price.