GW Storage Box insert V2
A simple solution for small apartment storage. I've found I have a bunch of half empty or just empty GW boxes lying around, so I measured and made inserts for magnet mats, so that I can store finished models inside for safe-keeping and cheap transportation to and from games.
You will have to venture out and buy magnet mats/steel sheets and some magnets/washers for the rest of it to work, but it is a way cheaper, and sturdier solution instead of Ikea or pre-made model boxes/bags.
(Photos are of V1, which had gap problems as well as being to flimsy on the underside.)