Introduction: Stretchy Pop Tab Watch
Got a watch that was too small. Made the wrist strap bigger by replacing it.
Follow this instructable: https://www.instructables.com/id/How-to-make-belts-and-bracelets-out-of-soda-pop-ta/ substituting elastic thread for string.
And instead of tying it off, tie it to a watch and wear it. My watch strap took about 20-22 tabs.