(Yes! It’s a functional Klein Bottle!)
You can find it here:
Website: https://shop.craftyintentions.com/b/ioMW6
Ravelry: https://www.ravelry.com/patterns/library/klein-bottle-dice-bag
Etsy: https://www.etsy.com/listing/4483978653/klein-bottle-dice-bag-pattern-by-crafty
