Quick and Easy Questions (please read the OP)

[Amaterasu]

Makes sense storage space I'm presuming would play a part in that.

What about the astral verse, is it endless? And if not how does that work I mean is it like one big black box with every bodies stuff in it. Does it grow depending on how many people access it?

None of the verses are endless, they all have boundaries at some point. They're of different size (The Underverse is the largest, for instance) but most range around the size of a country, and to my knowledge they don't change their size either.
(Not really sure what the rest of your question means, unfortunately)