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I usually spread my energy bar batter into the bottom of glass tupperware containers, or roll them into balls, then freeze or refrigerate them. I have an eight-piece set of round pyrex glass tupperware containers from Bed Bath& Beyond, and I also have a set of square and rectangular shaped ones from Costco. The containers come in all different sizes and stack well, which is quite convenient. Both sets have plastic tops, but as the food I put in them usually does not touch the top its fine. Even though they have plastic parts, at least the tops are reusable and don't get thrown out after one use. I hope this helps.