I made mine out of foam core boards..I used velcro to make the side panels stay on the board. I had used the cardboard style but the side panels looked wore-out after a bit.
I also made a bag to carry it in.
I took at vinyl table cloth..rectangle size. Folded it in half.(right sides together) stiched it up the sides..leaving the top open. Sewed on handles (either made out of ribbon or I cut down the tablecloth before I stiched it and used that.)
Now I have a waterproof bag to carry my board in
You can made the boards full size or cut the board in half and have little ones... It is very professional.