Don't want to shell out the money for the fancy tubes of tomato paste when its so much cheaper in the can?
I buy the most cost-effective size can of tomato paste, and split it into portions since no recipe ever calls for 14 ounces of tomato paste.
Take about 1/4 c paste and spread it in a snack bag so that it is flat. Push all the air our before sealing.
Freeze bags to make a thin sheet once it freezes. You can add the whole portion to a recipe, or even snap the sheet in half for a smaller amount.
The bags store easily being flat and stackable.