I made this with some of the string piecing I had done on the 3" wide adding machine paper..I am really trying to use up a lot of stuff I have around my sewing room...I will do again and quilt the fabric the next time..this was just to try out the idea...I had no real pattern just some measurements I saw on a lunch bag pattern someplace on line..
I added a pocket inside for an ice pack and will be sure the next one is large enough for a water bottle also...this one may be ok size for that..not tried that yet...