I utilize several different packs for hunting depending on type of hunt and duration, which I will break down.
For half day hunts, scouting, etc. in known areas where I need essentials, 2 bottles water, snacks, strap on extra clothes, etc.
Red Rocks Rover sling pack, 450", 11"x8"x5", great when carrying muzzleloader or bow. OR Badlands Nano fanny pack, 650", 2 bottle holders, waist belt pouches, very comfortable.
For full day hunts or colder weather and more gear. Cabelas Scout Elite pack 1800", waist belt, expandable area, water blatter holder etc.
My Colorado elk hunting pack is a Badlands 2800 pack. This pack will carry 3 days of gear and food and also carry out a load of meat or compress down to a day pack and is very comfortable.