Yes, the ability to hold enough pee without it leaking is something certain high quality nappies do far better than others. The ability to pull the moisture away from the skin as to reduce the chance of rash is done better by certain brands and I would hope the 'non-fakes' adhere to some sort of standard where the material doesn't affect the health of the skin as it's medically approved etc.

If your comment is correct, we could just wrap old tshirts around my babies arse.