Didn't know how many might be aware, but there is a readily available solution for storage of loose Genesis and Master System game cartridges. It comes in the form o the wood grain three drawer cassette tape storage bins that are normally found at charity thrifts these days. Sega happened to size their Genesis and Master System game cartridges exactly the same dimensionally as audio cassette tapes. Seeing that many of the Sega games that are found in the wild are loose carts, this is a great storage option. The only games I have found that do not fit into these tape cases are the EA, Accolade, Sonic & Knuckles, and Virtua Racing carts because they are oversized compared to the standard cart casing. FYI.