But every time I read about this sort of thing on-line, I find out that's not what the writer really means:
I just very sincerely don’t give a fuck.
It seems to me that those who really don't care don't bother putting their non-existent thoughts about the things they don't care about into words and then posting them to an international information network. Announcing loudly that one "doesn't care about X" is the way an adolescent shields him or herself from his own overwhelming feelings about X.
I own little, but I try and make sure that this little is reliable and safe. I buy what I want and need, of the best quality I can afford.
And it seems to me that if you truly didn't care about material possessions, you wouldn't waste the time and effort evaluating the quality, reliability, and safety of them before you acquire them, either. On a long enough time-line, everything is ephemeral. How much thought do you put into buying a paper cup?
It's easy for a geek, these days, to imagine that he's living a non-materialistic life, because his television, newspaper, telephone, phonebook, encyclopedia, almanac, dictionary, bookshelf full of books, music system, airline schedules, camera, day planner, calorie counter, robot personal trainer, star charts, robot translator, etc. all fit in one or two pockets.
The fact that those things are all software now doesn't mean you don't own them, or that they're not consuming a share of your awareness. From a certain point of view, the fact that you take this carefully curated collection of stuff with you everywhere you go may make you super-materialistic in a way that wasn't even possible just a few years ago.