For a daypack I use the Badlands Ultra Day pack. It is lightweight, and sleek but still offers enough room and comfort to carry gear, and a small (NC size) quartered out deer. It is very easy to draw a bow with the pack on. Very well built with an unconditional lifetime warranty.
For longer trips I use the Crooked Horn High Country Extreme II. It is large enough to hike in 12 days worth of gear, and still slim enough to draw a bow with it on. The tag said it weighed just over 6lbs, but mine weighs in at 5lbs 1oz. Very well built with a lifetime product warranty.