Alternative to posterboard - plastic pocket folder

I wanted a plastic replacement for any posterboard use on my FT3D; since my plane was to be covered in packing tape I was looking for an all moisture proof plane. What I came up with was a double pocket folder (Walmart, $1.38) that i cut up for the purpose. The folder is available in different colors. They had cheaper, thinner versions but this type was made of a sturdier plastic.

It worked really well, perfect for what I had in mind. It cuts easily with sissors and curved nicely for the canopy. I used it for the canopy top, wing tips, and vortex generators.