Stephanie....I have made several size bags in the early 1990's for my Hawaiian style quilting projects. I received a pattern like you referenced below called Mrs. Kimura's bag. She is no longer living but the story goes that she would
make these and when she flew to San Francisco return with sour dough bread in the bags. Mrs Kimura lived on the big island of Hawaii. The pattern has many uses and you can make in it in a number of sizes.
I love the frozen quilt you made. So pretty and I am sure it will be well loved. Kelela