[TOMT][HOUSEHOLD ITEM] One time use ice bag things.

I need to buy one of those plastic bag type tings that are sectioned off into squares, you fill the up with water and throw them in the freezer. Went onto amazon to order and realized i have no idea what they are called, all i could find were those things you put on bruises and the old time ice pack bags that look like a sack. If anyone knows the English or German word for this, it would be much appreciated!