One out fab customers, Lesley, has made this amazing tumbler bag.
This is what she said when she shared the video she followed to make this bag
I used a layer cake with my 3 ½“ tumbler, so I cut the layer cake in half and placed it on the die covering two and half tumblers and then the other piece of fabric on the other end, so that I had half tumblers to place on the ends to straighten the edge without cutting a tumbler in half. I do like to save fabric where possible.
This is the video that she followed of you would like to make one of these bags.