Well, here I go again...instead of forking over $20 for a commercially available wet panel carrier my creative self says "you can make that from crap laying around the garage" AND, "it shouldn't take more than 30 minutes". Of course it took more than 30 minutes but I did re-use a "found" 18"x24" campaign sign which makes it a one-of-a-kind.
Here are the steps:
This is the 18"24" campaign yard sign (I have already made the cuts necessary). It is made of corrugated plastic.
After measuring for the panel size I need to store (9"x12" for this one) I laid out the fold lines with pen and used a razor blade to carefully cut these channels to allow for folding.
Testing the folds:
Here I'm gluing guides (1/8" wood strips from Hobby Lobby) to the inside of the plastic shell. Super Glue works great. Space wood to allow for single or back-to-back storage of the panels you use. The two edge pieces of the box are also shown here - they have wood guides glued to them and aligned with the guides glued to the bottom of the main box.
Guides are spaced to store a single panel on each end and two back-to-back in the middle.
The box assembled. The two side/edge pieces are taped into place with strong duct tape - Gorilla Tape in this case:
I stuck on three hook and loop fasteners to the top flap will close securely:
Here's what it looks like with the panels loaded:
Good luck!