I've been using old terry towels to make "draft stoppers" for years...and I fill them with the cheapest rice I can find. The rice will last almost indefinitely as long as it doesn't get wet...and they work very well at keeping in the heat if and when we need it. More often, we're using them to keep our air-conditioning from leaking out.
I also make "hot and cold" compresses with the old terry towels...and rice. You can make them any size you like as well as any shape. To make them cold, place them in a plastic bag and pop them into the freezer. To make them warm, use the microwave.
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