"In my mind, everyone here is 5'6" and 130lbs."
I almost fit that description, except my proportions make me fatter! I'm 5'4" and about 152ish these days.
And while there's definitely plenty of gear in my size range, I often feel like half the people on this site are 6'0", what with all the long size bags I notice all over the place.
It's probably just a matter of overlooking gear that fits because it isn't what we want, and wishing the gear for sale that wouldn't fit us did so that we could complain about the price or quality.
That said, I'm pretty sure that purifier wouldn't fit me, so I'm not even going to make an offer.