[joelr]

I don't think infinity is nothing. It's definitely not every possibility. Conceptually you can have an infinite amount of something but still have an infinite amount of things not contained in that set.

The set of all odd numbers is conceptually infinite, an infinity in the mindscape as Rudy Rucker calls it.
But there are infinities of things not in that set and levels of infinities beyond that infinity as seen in transfinite number theory.

Cantor worked out that there are more than 1 type or levels of infinity. He had mathematical proofs as well.

There is an infinity beyond all others that is the ultimate infinity, which must contain everything called "Omega" or the Absolute Infinite.

As per the reflection principle any descriptions of this infinity are only pale reflections of the actual thing.

So that's all much more than nothing.

Even zero is the concept of "no quantity". But being a concept it's something.
"Nothing" in actuality can't even be a concept, take up space in the real or in the mindscape.
It seems like the Reflection Principle may also work for absolute nothing.