Only prop boxes I know of jack barsh at full throttle power sports. They are fiberglass . And can get in colors. I think they around 80 bucks.i had rather have those than the nylon bags.
Seems to me someone was selling nice plastic boxes on S&F last year. Did you search over there?
Bob (catfish123) and Matt had some I thought?? I know Matt did cause he had them at my place this summer.
I have one I will sell. It won't fit my 3 liter props now. It's plastic kinda shaped like a triangle but not. give me your phone number and i will text a pic to you.