If you have some scrap material, and long grain white rice, you have everything you need to make one of the easy microwavable heat packs. I used a piece of fleece, and a piece of cotton for the outside, and to keep the pack from getting too hot on the cotton side, I added a piece of t-shirt knit to line the cotton side. If you're using fabrics of equal weight on both sides, then a lining probably isn't necessary. If you don't have any fleece on hand, just about any heavy fabric will do -- canvas twill, denim from and old pair of jeans, or some thick towel terry cloth. Click on "read more" to continue...
My finished heat pack measures 14" X 4". I cut the 3 pieces of fabric 15" X 5" and used a 1/2" seam all around.
I then stacked the pieces with the 2 outer fabrics facing right sides together, and placed the lining for the print cotton side on top of the back side of the cotton.
I folded and pressed a hem on one end (that will be the open end for filling -- you'll sew that closed later).
Using a 1/2" seam allowance, I sewed around the edge of the 3 unfolded sides, then trimmed the seam allowance of the fleece, and knit lining fabrics.
After turning, and pressing, use a pin or marking pen/tailors chalk to mark the middle, and 1/4 points of the length.
Fill the first (bottom) section with rice. For this size heat pack I used about 3/4 cup of rice.
Sew across, through all layers of the fabric, and then fill and sew the next section.
After filling the last section, sew across the folded edge that you created at the start.
Heat the pack in the microwave for about 1 minute. Depending on your microwave, and the size of your heat pack you may need to extend that time.