How to Make a Travel Case for Your Toothbrush

When I travel, I usually have to find creative ways to pack my toothbrush.  I used to try to cram it into a sandwich bag, but they always ripped.  Then, I just wrapped it up in a grocery bag; but that didn't really protect it from dust and dirt.  From now on, I'm doing this instead...

Honestly, why didn't I ever think of this?