Picked up a small Plano Field Box last night at the store thinking I could use it to store something. This morning looking at the dimensions I thought this could work for magazine storage. So went out to garage. Note to self, need to get some kind of heat out there before next winter. I dug out some scrap wood Built a divider for the box. I then cut a 1" thick piece of foam to line bottom of the box, did this to protect followers and feed lips.
It will hold 15 mags total in standard or compact size. I don't have any sub-compact mags to see if they will fit it, I would think I'd have to make divider shorter for them. Heres what I ended up with.