A friend of mine showed me a clever way to fold a plastic grocery bag.  I'm sure everyone else knows this trick already, but I thought it was great!  I've got bags bunched under every bathroom cabinet and under the kitchen sink, and this is a real space-saver.

First, straighten the sides of the bag by pulling the handle and the bottom pleat in opposite directions.  Then, fold over (about 2 1/2 in. fold) along one side.  Then, wrap around two fingers until you have it all rolled up except for the handles.  Then, tuck the handles in the roll.

I wish I were clever enough to come up with these tricks on my own!  Share your thrifty tricks in comments, if you like.