I'm sorry to "spring" this on you all, but these little beauties can really hurt your finger if you're not careful. Just ask me....I'm the one with the little red index finger. Beware. They are not as innocent as they look.
My Mom got me into the habit of using clothespins to keep food packages closed, like loaves of bread, potato chip bags, etc. That was a long time ago before stores sold the special bag clips they now have.