Disclaimer: I'm new to D&D 5e and am currently playing my first campaign.
Recently we had a situation where another player had acquired a large number of bags of holding. Initially he was going to store the extras inside a single bag of holding, but the rest of the party quickly objected to this citing the well-known consequences of putting extradimensional objects inside other extradimensional objects.
However, I also know that the rules state that inverting a bag of holding causes all held items to spill out. This doesn't cause a rift to the Astral plane to open, and you don't consider the rest of the universe to be inside the bag of holding.
I assume this means that inverting a bag of holding must somehow collapse its pocket dimension temporarily until the bag is returned to a non-inverted state. If this is the case, it's effectively a normal bag until righted.
What are the consequences of putting an inside-out bag of holding inside a bag of holding? As far as I'm aware, there's nothing in the rules about this (not that I know the rules very well). Is this a valid way to store many bags of holding?