+1 on the HAWG (Military HAWG has slightly more room than Civilian HAWG, at least that used to be the case).
I had a Maxpedition Falcon-II, and it's a good day hiking pack as well, but I like camelbak packs for the insulated water bladder pocket. If you freeze a chunk of ice in the bladder, your water stays cold for a loooong time. :thumbup: Having one large main compartment (in contrast to the two slimmer compartments in the Falcon-II) is nice too, if you want to carry bulkier items.
I don't put much on the MOLLE webbing because then weight tends to settle farther from your back and you're more likely to get snagged, but I did add a Maxped 7x5x2 horizontal low profile pouch above the exterior compartment on the pack. It adds a nice extra pocket without changing the weight balance significantly or offering much beyond the existing profile of the pack to snag.
The Camelbak HAWG is a winner for me for a dayhiking pack (and I've used a regular ole Jansport, Camelbak civilian HAWG, Camelbak Alpine Explorer, Maxpedition Falcon-II, and Osprey Kestrel 38). Just enough room, compact, and tough. Not as comfortable for long treks carrying a lot of weight as my Osprey is, but perfect for most outings. Also check out
Joe's review.
The only feature missing on the mil HAWG for me is the straps on the bottom of the pack. Sometimes I like to throw a blanket or something under there, and so far I've been using paracord and cordlocks in conjunction with the provided webbing anchors. I am going to make snap buckle straps for the bottom of the pack, just haven't gotten around to sewing it yet.
ETA: On a side note, even though I prefer using bladders, the one feature I miss on both the Maxped Falcon-II and Camelbak mil HAWG is the bottle holder mesh pockets on the sides of the pack. I love em for storing a guyot/cup/stove set or holding random quick access items (snacks, beanie, gloves, etc). I've been thinking about picking up a Pygmy Falcon for this reason, but will probably be using it more for EDC. Wish someone would make an integrated hydration pack around 25L that also had side bottle pockets....
ETA2: Also check out the Camelbak HAWG 500 for the lighter cordura.