I just get some of the small (shoe box size) plastic boxes from one of the $ stores and use a magic marker to note what's inside on the end of the box.. All magazines, holsters, etc. for a given type of gun go into a box, and then they're stacked outside the gun safe on a shelf. (I have one for miscellaneous stuff, too.) I leave some guns in the factory box with an extra mag or two in the box, and overflow in the shoe boxes.