I've used these little spring clips for decades. I always keep a few handy - a model train, kitchen, office, garage, tool box, even in my car. Useful as clips. in numerous model trains. The best zippers for closing bags of groceries - french fries, frozen vegetables, etc. - are much better than the flimsy plastic zippers sold for this purpose. Hitherto I've bought them from a big hardware store, but the offer was too good to turn it down. There are never too many of them.