"The only reason that the definition becomes important is in the requirements of the pack."
Well put, Malto.
"Ultimate direction: PB adventure vest. With the thoughtful selection process you can fill it up with a luxurious UL kit."
The words of a true minimalist :) I tried loading my overnight kit into the adventure vest, but wasn't crazy about how it carried with full food. Probably related to the problems with load density that you were mentioning, Aaron. Since the vests are meant to fit like clothing, getting everything cinched right is especially important and I don't think I found it with the PB.
Its nice to run this question by a crowd thats clearly tinkered and thought over the details. This style of travel definitely has pretty specific gear requirements. I'm excited for the new trip potential that it opens up, but I also need to ramp up my running gradually, and listen to my body.
Sort of a tangent, but part of what inspired me to look into fastpacking again was researching Brett Maune's classic JMT record (yes classic.) So awe inspiring that a determined hiker could come out of the woodwork, blow away all previous times and set a record barely 90 minuetes slower than the recent supported time by two TNF pro studs. Its almost offensive that there was little mention of Maune or his stout FKT in their TR. Its lame that apparently you need to have a strava account, sponsors, wear compression socks and bright cloths to have real credibility in the ultra community (a couple side notes: compression socks do work, & ultra-running is genuinely bad-a.) Anyway, point being: Brett Maune is the man.