The three things that have most impacted my minimalism are:
kid
self-employment
disabilities
For kid, I like to give him something of "normal", so that his friends are comfy spending time here, he's not embarrassed, people stop thinking we're poor and charity-ing us, etc. I like this decision very much. Travelling full-time with a kid could eliminate this piece, as no one expects a child "on the road" to have stuff. Spectators would assume he has them at home. They'd be wrong, but their assumption would alleviate some pressures.
Self-employment means very thick tax return files, project pieces, printer, some electronics. Normal employment or no employment would have eliminated one crate.
Disabilities are more thick files, and some equipment. These are simply worth having.
I imagine that when kid grows up and heads out, I will likely go back to almost nothing, as it's my nature. By then, the "past seven years" of tax returns will be very skinny again, and his disability stuff will be in his home. I guess I will live in a standard tiny home then, or rent a room in a shared house. My own stuff is about what Spartana describes.
On the flip side, I realize it's very helpful that I don't have an equipment-based hobby (collections, tool-intensive sport, hunting, etc). My kid, on the other hand, is very "sensory" oriented and thrives with everything from tennis rackets to screwdrivers, and I would really want to see him honour that to a balanced degree (not more than he actually needs, but also not less for the sake of minimalism).