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I have one's like that but use rice. I just took a strip of material about 3' x 18" and sewed both ends (short ends) together and then put a stitch in for sections - you can make as big or small sections as you want then I usually add rice, pin them shut and stitch the long end closed. For cooling put in freezer for heat put in microwave. I haven't used corn so not sure what kind to use but rice works great and is really inexpensive.
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