Easy heat-up rice bag and flannel case tutorial! Great DIY gift

This is one of the oldest DIY projects I've been doing because it's so practical and obvious. I've made several of them to give as gifts and for ourselves, and they do wear out (or burn) over time, so this time when I made us another one I took photos and wrote up these instructions so you can make one too! When I was little my mom ordered a microwaveable barley-filled fabric pillow ("the barley