hi: we seem to have the same type of leftovers over and over! unfortuantely we store these in opaque containers and are forever thinking we dont neet margarine only to find out it was really pasta sauce leftovers! So..... i printed up a sheet of small labels on my computer with stuff like pasta sauce, sloppy joe, vegetables soup etc. put it on the fridge with a magnet. now when i stick leftovers in a solid colored container i grab the appropriate label, plaster it on top and never run out of margarine!