Less is more.
I never had a huge amount of stuff, but we accumulated lots in the first decade we were married, through gifts and having kids, etc. When we moved house about 7 years ago, we got rid of loads, while also moving to a larger house. Since then we’ve been pretty ruthless about not acquiring more, and getting rid of things we don’t us. I hate clutter, so this suits me down to the ground.
I moved office at work a couple of years ago, after about 12 years in the same one. I moved with two copier paper boxes to carry everything.
It might be genetic – my brother had a fairly nomadic life for a few years, moving between Cornwall and the French Alps with the snowboarding/surfing seasons, and always moved with just a rucksack of stuff.