I use an REI Flash 30 pack that I bought in 2010. It doesn't weigh a ton like so many day packs out there. It also doesn't have a full suspension, only a bendy framesheet. But the padded hip belt does manage to transfer most of the weight to my hips. It works well enough for me, but I rarely carry more than 2 liters of water or more than a total of 12 lbs.

It works well enough for me. YMMV.