My hair gel comes in a tube. When I think it's completely empty, I KNOW there is still product inside that I can't get to. So I cut the tube in sections. Any section with product I put in a zip lock bag. I often get another 1/2 doz applications. It definitely justifies the 2 cents for the bag. I also do this with liquid bath soap, shampoo, anything in a container that can be cut with a scissors. Savings for me, less waste in a landfill.