Well looks like "rubber" and "gum" have the same meanings all over the place.
Now I came in to tell you about the hoarding habits of my mum.
When she buys a new appliance, such as an iron, toaster, electric frypan, she finds it difficult to throw the old one away. So, what she does is take the new one out of the box, and uses it, and puts the old one IN that same box, and then stores it away in the garage or in a cupboard.