Lol, its not a box. We just took his closet that was already in the wall & lined it with panda plastic, and stretched a piece in between the doors & put one of those tarp zippers on it. I'm retarded though, and fucked the zipper up so it's not light and kinda glows lol, but all together just simply lining the pre-existing closet with that plastic and the zipper was like 40 bucks total.

We went to a shop that had the plastic on a roll and sold it for $1.50 a foot which is actually 10 square feet cause it un-folds 10 feet wide, so we only had to buy like 15 or 18 feet which was like 150-180 square feet. And just simply used a staple gun to tack it up and covered the seams with duct tape. And the zipper is badass, you just stick it on to the plastic and then open it and follow the metal part with a razor blade and cut it as long as you need it to open.