To properly dispose of the hot/cold gel packs you should simply place them in a normal waste container. However, to do this in an environmentally friendly way you can put them in the yellow container, as it is not a toxic product and the gel is usually biodegradable. However, keep in mind that if the compress breaks, you should not pour the gel directly down the drain or it will clog it up. Instead, put it in a pad and dispose of it.