Are you talking about the tray like things that have ties in each corner? They are flat, then when you need them you tie them up to form side. I have made them & have some WAY BACK in the projects, but I use Velcro to close them. I'll go see if I can find how to get to the instructions and picture. The directions are in a book by Mary Mulari called Made For Travel.
I can't help either. I was hoping someone would have an answer so I could see what you mean. Good luck.
TTT
Sorry; don't know. Perhaps you could describe it some more.