Use the top of a bag as a tie

I've been using this sneaky trick for YEARS.  Cooking for just two for such a long time, I often only needed half a bag of something for dinner.  Ravioli, frozen veggies, baby spinach, etc.  Instead of using bag clips (especially in the freezer), I just started cutting off the top of the bag and then using it to tie off the top and keep the remainder fresh.