I currently use a Cabelas Gun&Bow pack, which is good for hunting in and the layout well thought out. However it doesn't seem to be made for people with a waist under 33", can't adjust it down far enough to keep the weight on the hips.

For a day pack the Cabelas Elite Scout Pack is also good. In a pinch it can haul a good amount of meat (my 6X6's head came out on one) but it's not ideal for that.

Both of these have internal hydration.

Now I am looking at the Eberlestock J107. I like their integrated rifle scabbard design.