[Closed] Backpack with protection for the skinny

I'm in the market for a backpack with back protection. 12-16 litres, space for hydration bladder (2L camelback).

I'm 5'10 and weigh about 135 lbs, so a skinny bastard (no muscles either, just bones). Thus it's not a given that any backpack will be adjustable enough to fit me nicely, especially in summer with minimal clothing (my current Deuter Race is slightly too big in that the chest strap can't be made quite tight enough for my liking).

Any packs in particular that would have a good chance of fitting me? Evoc Enduro is at the top of the list right now, how is that for adjustability?