cheerio Alison!
you know, that's funny you mention the wheat bags. in september i was in the hospital for a week & a physician came in to check on me, i had my heating pad...and he yelled at me well, not yelled at me...but wasn't happy as to i might set the place on fire.
he suggested:
i get a tube sock, fill it with slow cook brown rice, add a pinch of water, and microwave this rice sock & use it as a heating pad. funny stuff.
nonetheless...I HID MY HEATING PAD the entire length of stay.
you take good care, talk to you soon!
erin