Bean bags made to microwave for comfort are big in the Timm household. I'm not sure if Carol has ever made one using actual beans, she most often uses rice. They are usually about 7" X 9" and made out a heavy fabric like this one made out of a corduroy shirt.
The bags are far from filled, when laided flat as this one is, the rice is about 1" thick uniformly. 2 minutes in the microwave is usually plenty and they stay warm for 15 to 20 minutes.
They are great to warm up your hands on a cold day and I will often place one on an ach or pain.
That being said I would NOT use one to warm up a pet.

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