Thermal bag
From Wikipedia, the free encyclopedia
A thermal bag is a type of thermally insulated shipping container in the form of a bag which can be carried, usually made of thermally insulating materials and sometimes a refrigerant gel. It is used to help maintain the temperature of its contents, keeping cold items cold, and hot items hot.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Cool_Green_Bag_Large.jpg/640px-Cool_Green_Bag_Large.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Hot_Cold_Bag_Small.jpg/640px-Hot_Cold_Bag_Small.jpg)
Insulated bags have been in use for many years in industry, medical/pharmaceutical use, food delivery, lunch bags, etc. Several designs have been available.[1][2][3][4]