Game Box Protectors – Japanese Sizes

I’m a great believer in game box protectors. With vintage games only getting older, anything that helps them (and their related paraphernalia) to stay in great condition without being fully archived is a great investment.

I recently got some box protectors for my Japanese Game Boy/Game Boy Color games. There are two sizes for Japanese Game Boy games, the original size which are very small, and a later size which is about 4/5 of the ‘standard’ Famicom box size. This later size continued through the Game Boy Color era too.

Previously I had stored my small Japanese Game Boy games in Japanese Game Boy Advance protectors, which were okay in one direction, but way too big in the other two.

Similarly, I kept my larger Japanese Game Boy games in Famicom box protectors, which was a closer fit but still quite a lot of room at the top.

It’s great to finally have my Game Boy games secure in snug fitting protectors.

Adaptations for less common sizes

I was glad to find these Japanese Game Boy sizes, as a good fit is important for protection. It’s hard (or impossible) to find decent box protectors for less common box sizes, so here are some adaptations of sizes designed for other purposes that I use. While usually not perfect, they are good enough for solid protection without too much internal movement.

Japanese Game Boy Advance size works very well for the ‘mid size’ Famicom boxes

Only a small amount of room to move.

Western Game Boy protectors obviously work perfectly for Virtual Boy boxes.

NES protectors work nearly perfectly for the large size Konami Famicom games.

The unique Gun Sight box is nearly an exact match for Euro NES size protectors.

Famicom protectors work okay for small SG1000 games. It’s not really the right size in any direction and is very tight, but protects okay.

Large SG1000 boxes are a perfect match for an older style ‘too big’ NES protector size I found.

And these new small Japanese GB work very well for Famicom Mini GBA games

And finally, I’ve recently tried Nintendo 64 cartridge protectors on my small box Famicom games.

The fit is not perfect, much like the SG1000 games in large box Famicom protectors, they’re too tight in thickness, but too large in other directions, so they fit, but are somewhat tight. Until there is a better option, it’s a decent solution.


I had customs done for all these SG1000/Mark III box sizes. It’s a fully one off for Alex Kidd BMX (it’s the only box of that size), but a few each for the two card game sizes and big box Mark III gold.

Unfortunately the producer of these customs has quit the business, so I’m on the lookout for a new producer, if anyone knows of one!


10 thoughts on “Game Box Protectors – Japanese Sizes

  1. Sega Dude March 23, 2019 / 4:01 am

    I don’t have any box protectors for my Sega Mark III games. And I’m very jelly of the Alex Kidd BMZ trail! That’s the one last game I’d like to get for my Mark III collection.


  2. Anohitono July 21, 2019 / 3:20 am

    Came here while looking for protection boxes for SEGA mark 3 Alex Kidd Bmx, Miracle warriors, phantasy star and the both formats of the Mycards. Did you ever find a new supplier for these custom formats?


    • D.Lo July 21, 2019 / 12:42 pm

      Unfortunately not. They were fully custom and the supplier disappeared, no returned emails.


  3. Anohitono July 21, 2019 / 3:22 am

    Did you ever find a new supplier for these custom Mark 3/Mycard boxes? I’m looking for more fitting boxes too.


  4. Peter April 14, 2020 / 9:50 pm

    Hi, Can I get in contact with you? I have a small business in gaming related products and began producing box protectors a while ago, but have some trouble determining the Japanese Sizes. It seems you have a lot of knowledge about whats going on there with the sizes 🙂


    • D.Lo April 14, 2020 / 10:37 pm

      Sure, no problem 😉


      • Peter April 14, 2020 / 10:50 pm

        Thanks! I can contact on the FB NSJ Japan?


  5. Captain HIT July 22, 2020 / 11:33 pm

    Hello, I’m looking for the box you used for Gun Sight box which is nearly an exact match for Euro NES size protectors. I’d love to get some of these for my Euro NES boxes. Where can I find them?
    Thank you!


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