The hard case has special feature to hold the blade. The blade is not moved by pressure from the both side of the sponge pad.
The logic of the case is like; If we put on a blade in the middle of a telephone book, and binding it, the blade does not move from the pressure by the both side of the phone book pages. Or we see sometimes martial art master without a sword fights against an opponent with sword, he binds the sword blade with hands, and twist the sword, and taking it away from the opponent hands. I have tried to make cooking hard case for over 7 years, and it is very hard to get great idea to make the cooking knife hard case for years, because it must be friendly and easy on the blade edge (no damage on the edge), of course, safety to carrying the case is always the first priority, and universal size, and not too expensive the cost (possible to make it), and good looking, and more. All things comes in one case is very hard, and I had got this idea a year ago, and I tried to make proto type with my father who makes case or bag for his entire life (he has owned a small case making company for over 60 years in Japan) many times, and finally, my father made realistic new type (I guess) of the cooking knife hard case. Of course, the knife does not move in the case even shaking the case very hard, and it is hard case, so it is not able to bend the case itself unless hundreds pounds of weight on the case.