I've been keeping an eye out for some rice. I saw a 25# bag in Wally World for about $5

I just made something similar for my daughter last night. It looks like a Japanese Obi, sorta. All you do is make a big pocket, I think it was about 10x6 inches with wide ties attached. You could make the pocket part any size you wanted. You could also make the ties as wide and long as you want to as well. You attach the ties to the pocket before you turn it. The pocket is made similar to a pillow cover, where the opening in lapped, but there is no button or zipper.
The warming insert is made just slightly smaller then the pocket. It is simply a square, or whatever matches your pocket with tunnels sewn in to keep the rice or flax separate and flat. I made three for my daughter so that she could warm one and freeze one and have a spare.
The only thing I would differently is probably make the ties a little longer. I think ideally they should be long enough to cross in the front and then go around your waist and then tie in front.
I made this for her lower back, but it could be used anywhere you needed hot or cold therapy. Plus you could actually use the pack part for keeping food warm or cold as well.
I found the pattern in the One Yard Wonders book. But I did a little adapting.

Here's a website for a scented trivet. (It's the maple leaf pattern & is a free download.) I made a few of these and sold them at our craft show.

http://www.freepatterns.com/search.h...riteria=trivet

Hi I make mine with feeding corn & use fleece you get a moist heat you can make them any size

lavendar buds, what and where do I get these? Does it make everything smell better than rice?

lavendar buds, what and where do I get these? Does it make everything smell better than rice?

I like the idea of denim! If you get corn from a farm store, do we still need to bake it to kill the bugs? I may make some of these, I have made rice bags but like the idea of the corn stay warm longer.

My mother made "corn bags" to warm our feet in bed when sleeping in an unheated room. She bought the corn in a farm supply store as she lived on the farm. I made "rice bags" for the same purpose from 1/2 of a hand towel. I just sewed up the seam, added the rice, and sewed across the top. When it gets dirty, just make another one. The rice goes to one spot but that helps it stay warm longer.

We use tube socks or old knee high cotton socks. Fill with rice and knot at the end. Heat on high for 2-4 mins. I like mine HOT. I have used them for bed warmers in winter. Heat one and put it in bed before you got, nice and toasty. I use them for my neck or stomach when they are sore or hurting. LOVE MY SOCK! My son made one!

I make a muslin bag to put the rice in and then make a bag from a fingertip towel to put over mine. I sew the end shut with long machine stitches, so when the outside gets dirty, I can take it off, wash it, and put it back on. That way the rice doesn't get wet. I keep the rice loose in the bag, so it conforms to my neck, shoulder, feet, etc. whichever needs the heat. I can't go to sleep with cold feet, so that's where I use mine the most.