If you have ever been to Japan (and I assume other asian countries) and buy condoms there, you will realize that the volume of the condom is less than that of other western places (in my case, the US.)
However, we all know that latex can streeeeeeeeeeeeeeeeeeeeeetch.
The condoms are tighter on the Japanese, too. That is what they see as normal… tight-fitting condoms as opposed to looser-fitting ones.