The ones you open, use twice, and realise were a mistake?
Currently, I put them in a draw with a lot of other 'spare' things, in case, I suppose, I change colour and they come to suit me one day or because I paid for them and don't want to waste them.
But is there something I can do with them? What do you do with yours? I think you are going to say, 'bin them.' I am too tight by half, I know.