Ah well, it had to happen eventually, but it still makes me sad.
Someone out in the vast expanses of the Internet has started making dice bags that look suspiciously like my original design. Sure, it doesn't take a rocket scientist to make a reversible, square bottomed dice bag that stands up and has a drawstring closure with a toggle, but there are other ways to make them. So, it is distressing that these bags are identical in design, dimension, and price as mine.
I knew that this would happen eventually, but like I said, it still makes me sad.
(The image above is of my own dice bags, which can be found here.)