Quote Originally Posted by Ecaz View Post
So, would it be agreed that the Vapor Trail is a great pack for a thru-hiker?
IMO, yes -- if you can keep your total weight (including food, water, etc.) to 30 lbs or less.

Is this considered (by hikers here) to be an ultra-light pack, and how many days of food can one expect to support with this pack? (clearly gear dependent question, but generalize)
No, it's not ultra-light, as packs go. IMO, an ultra-light pack would weigh well under one pound. But any UL pack, by that definition, would probably be limited to around 15 lbs. total load.