Duplication! Buy spares. Why? When we left our daughter’s “doggie” toy at the nanny’s, she still had another at home to sleep with. When she puked on her mittens, I had another pair for the next day. (If you buy two pairs of mitts in the same colour, you can lose two and still have a pair. Or wash one and still have warm hands!) When she ripped the ties off her hat, I put on the other one and fixed the old one when I had time. Duplication rules.