If you need to move temperature-specific pharmaceuticals, look no further than the COLDPACK messenger bag. This is perfect for vaccination outreaches and/or emergency responses, to get and give biological samples, blood bags and many hoers! This bag ensures maximum protection without being bulky and wasteful. The Airliner is the insulating material that keeps products at just the right temperature. This bag is easy to put together. Once it is put together, all you have to do is put the products in to the bag and go! It is extremely simple and convenient to use and it works extremely well!