Absorb water ice pack
1.For outdoor transportation to keep cool
2.The lightest ice pack
3.The cheapest ice pack
4.Can be in different size ,many cells.
1.Place in water fabric side down,to allow polymer to react with water,and fully expand sheet.
2.Towel dry,then stack in freezer plastic side down. Do not allow textilesurfaces to touch each other or freezer shelves during freezing process or sheets may stick together.
3.Sheets can be bulk hydrated and frozen without towel drying for one way transport for perishables.