Jeff,
This ain't a dumb question at all. It's one I wrestled with in the beginning and have perfected over the years. My answer is you need two packs. The first pack is small, contains your hunting essentials, emergency stuff for an unexpected night in the woods, plenty of water and enough to process the animal when it's initially on the ground. A day pack size or the one I'm fond of and use is the Badlands 2200. This first pack should be around the 20# weight size so it's not a weight burden. My list of hunting equipt I carry is as follows:
Hunting Pack Contents
Optics
1. Binocs: Steiner 8 by 30 Night hunter
Water
1. Camelbak 102 ounce hydration bladder
Navigation & Communication
1. GPS Garmin Rino 530, includes a FRS 2 way radio, Weather Service Radio, altimeter, digital compass and GPS capability
2. Cammenga Tritium Military compass
3. Waterproof Topo Map of area I’m hunting
Cutlery
1. Buck 112 folder
2. Knives of Alaska Light Hunter Combo, includes a skinning/field dressing knife and a small detail caping knife.
3. Small Hatchet
4. Hack Saw blade wrapped in Duct tape handle
5. Diamond based sharpener tool
First Aid Kit
1. Kit for emergencies, including sutures, pain-killer and the normal first aid stuff. Keep it small.
Emergency Bag
1. One heavy weight plastic trash bag (rain poncho, water collection etc.)
2. One unbreakable signal mirror & Whistle
3. MSR Miox emergency water purification system
4. Fire Starter (commercial fire tabs or petroleum soaked cotton balls)
5. Magnesium based fire starter and disposable butane lighter
6. Foil based Space Blanket (emergency warmth & lay out quarters on after field butchering)
7. 50’ Para cord & Military poncho for shelter
8. Heavy Duty Needle/Thread
Food
1. WWII vintage canteen cup w/ attached cook stove, & fuel tabs
2. dry soup & hot chocolate powders
3. Trail mix, nuts, candy bars etc.
Miscellaneous
1. License, tags, waterproof pen, pencil & paper
2. spare batteries & bulb
3. extra bow string & finger tab
4. small roll surveyor’s tape
5. Digital camera
6. Zippered cotton pillow cases or Game Quarters Bags
Optional (Depending on climate, conditions & activity)
1. Tripod and Spotting scope
2. Packable Rain Gear
I've found that the real trick is keeping the danged daypack light. There's a tendency to think that more is better, although less is actually better.
The other pack is a monster full sized load bearing pack frame. I normally keep this pack at my camp or vehicle. I make the first trip out w/ the cape and/or backstraps in the smaller pack and convert to the larger pack to haul quarters. The larger packs I've used are the Kifaru Long Hunter freighter and most recently the Badlands 4500. Don't forget plenty of water in the second pack too. No sense in cramping up carrying the heavy load.