I've yet to do a TRUE bivy hunt. ( Bivy hunt definition: hunt with your whole kit on your back then sleep wherever your hunt ends that day)
What I have done is hiked in and set up a spike camp then hunted from that.
On my first backpack hunt my Dad killed a calf moose and I packed out all of the boned out meat. It was only 1 mile back to our truck so it was no that bad, BUT the pack weighed 122 lbs.
I have modified a an eberlestock pack so all that is left is the harness and frame. I then strap a dry bag on to this to lower the weight. It works great for light loads and OK for heavy stuff
What I really like for water out of a spike camp is a gravity filter. I HATED pumping water in the dark after a LONG day of hunting.
I use a golite hex 3 for my Dad and I and it works good for two guys. This year on our elk hunt we added an 8×10 silnylon tarp and rigged it up over the door to act as a vestibule, this made for a very comfortable camp.
I have my gear pretty dialed in but added a few things this off season that I am excited about.
I picked up a westcomb specter event jacket, mb ul down inner jacket, WM apache bag, MEC 165 gr/m2 merino hoody and I am excited to use these pieces in the field.
I live in Ontario Canada and this type of hunting is unheard of, people think my Dad and I are nuts. Everyone here drives around on ATV's and doesn't venture far off the road.
Combining backpacking and hunting is awesome. It requires different/more gear and techniques but the basics of hiking are very much involved.
I suspect that many seasoned hikers would make pretty good backcountry hunters as well.