There's probably an Axiom with someone's name associated with this phenomenon of modern day American culture, viz. "Possessions will tend to fill any and all available space." A corollary to the well known "a computer program will grow to fill all available memory" (not so true anymore, but for two or three decades was often very true).
Years ago, for nearly a decade, all my possessions fit in the trunk of my car, which was ~16 cu. ft. of trunk space. The possessions fit with quite a bit of space left over. All my worldly possessions consisted of one seabag of clothing (military issue and a few civies), and one of gear and some civies; also two boxes of books, approximately 50lbs each; oh...and some mechanics tools, and spare belts and hoses for the car - and a spare thermostat. That's far less (something less than ~453 liters) than the volume suggested by the original poster (if you exclude the "wheels").
When you shipped out only one seabag was taken and the car and the remaining possessions were left behind, to be reclaimed upon return.
Had planned on making a career of the military (as my father, in fact, did - a family tradition) and then retiring and living in a camper on the back of a pickup truck - nice to be able to "move" my humble abode from place to place as the winds of fate blew. So,...what happened?
Met a girl!!! That 'bout says it all. [Fortunately, for me, my father also had previously met a girl - another family tradition apparently, but at a much later stage in his military career.]
Now...it takes a house! What happened? Got married, had kids, several dogs, a ton of tools for working on/fixing cars and most anything around the house; and oh, yes...a small storage room full of gear, and spare parts for aging appliances and cars (nunquam non paratus - "never, not prepared").
The only thing that saves it from being a larger house, is that now many, many books can fit on a laptop computer's hard drive. If only i could do that with the tools!
Periodically, the gear closet is purged and items given away or occasionally sold; the tools - almost never divested of, but it's happened twice. Of course, getting rid of gear and tools means that...yes, that's right...there's room for more gear and tools. Yes...I know...re-acquisition is NOT the point of the exercise, but it sometimes happens.
Life was simpler then. Life is better now, but sometimes i still miss the old, simpler life. ...I think I'll go fix something now, or read a book.