i've owned a dakine nomad for several years. only negative was the leaky nalgene bladder (which rei let me swap for a camelbak bladder). anyway, glad to see dakine resolved this issue with a new and improved bladder system. venting system has improved somewhat as well.
the difference between the nomad and this pack are essentially a large, full pack length storage pocket and external side pockets (handy) of the larger nomad. but the nomad is bigger and sits lower. 90% of my rides i can use the smaller drafter pack. this line of dakine packs are made of heavy duty material which allows them to stay firm and keep their shape- and will last forever. the inside organization pockets are well thought out.
for mtn biking this pack can save you. i crashed in a rock garden not wearing my body armor, flipped onto a large rock on my back, and the nomad saved my spine. felt like i landed on a water bed. well, almost. packs with lightweight materials may not be as firm or in-place when you eat it, and likely won't come away as unscathed as the nomad does time and again. if you're a weight weenie, look elsewhere, like maybe the AMP line, but if you ride aggressively you're in the right place.
for cool weather if carrying extra clothes or gear, go nomad, otherwise the drafter is the ticket if you want 3l (100oz) hydration.
btw- beware of biking with packs with metal frames. they may vent well, but can be dangerous on a spill.