Little pillows of cold in a convenient, relatively thin, flexible sheet. Have used product for years to keep food cold in lunchbox and was not able to find replacement in local stores. Last quite a while with daily use.

Soaked in h20 and puffed with its tiny hydrophilic granules. Water penetrates the white paper side but doesn't leak out ever.

Save yourself grief and money. It takes to much prep. However their longevity seems to be on the decline.

Didn't seem to work very good keeping my sodas cold no more than 3-4 hrs. When they begin to thaw, that slimy substance leaks out of it and onto the items the are keeping cold. They have to be laid out individually until frozen which takes up too much...  Read More

Not all 5 are completely full even though i soaked it for a long period of time. The powder that is submerged with water starts to leak out as the pack unfreezes. It leaks out of the cell dividers.