Here's a rundown of the best hunting packs listed from smallest to largest. There's also a description for each pack and what situation you would want to use it for.
1,000-2,500 Cubic Inches
My Choice: Kifaru Scout
If you are looking for a pack that will work well when hunting by the truck and mobility is key, then this pack size is what you want. This is not a load hauler by any means, but it can handle a decent amount of weight when needed. These packs also work great for turkey and antelope hunting as well as those quick trips into the wilderness that don’t require a ton of gear.
The Kifaru scout is rated at 1,200 cubic inches (it’s a little larger then that I think), but with the added 2-quart canteen pockets, I can easily get day's worth of gear inside as well as a jacket and an extra base layer. This pack also has a couple internal pockets that make organization a little easier. The max comfort load on the Scout is 30-40 lbs.