Finally a good way to protect your full kit CAVE boxes. The online shop Save your games has made exactly that!
It is a very sturdy transparent plastic casing, similar what you see a lot these days for older console boxed games. It slips very tightly around the carton box. It is not air tight, but that is allright.
It is compatible with the following kits:
Death Smiles Mega black label
Do-don-pachi Daj ou jou Black Label
Do-don-pachi Daj ou jou
Do-Don-pachi Dai-fukkatsu black label
Ibara Kuro black label
Muchi Muchi pork
Mushihimesama futari black label