You can make a wheat bag if you have access to a sewing machine or are patient...

Get some wheat (a kilo or two) wholegrain - a natural foodstore might have it? I got mine from a farm which grows it, dunno if you have that option.

I used an old cotton pillowcase to make my bag. My wheat bag is rectangular, the length of the width of a pillowcase and about 8 inches wide, and has 16 "cells" each filled with wheat but not tightly packed, think like the amount of tea in a teabag - you can shake it into one lump or spread it out and it fills the space right?

First cut the bit of pillowcase off that you want - if it's going to be 10 inches wide then cut it about 11 inches from the end seam so you have seaming room. Then sew four straight lines in it from the bottom end to the raw edge, making 4 equal-sized channels. Put a handful of wheat into each channel and shake it down right to the bottom. Sew a line across all the channels about 2 inches up, trapping the wheat in 4 pockets. THen another handful of wheat in each and sew across again. I did this 4 times until i had a pad 4 pockets by 4 pockets, each pocket being about 2 inches by 4 inches and loosely filled with wheat. THen turn what is left of the fabric (the raw edge) into the last pocket and sew it firmly down, thus sealing the last set of pockets.

To heat you put it in the microwave on high for 3-4 minutes (feel it after 2 and see how warm it is). The heat lasts a couple of hours. To avoid it "going on fire" don't micro it for more than 4 minutes, and let it go almost totally cold before re-heating it (make 2 if you need more intense heat all the time). If you want to make it smell nice add some dried lavender flowers to each handful of wheat.

Bx