This may not help much because I am not a backpacking super trooper. I live in the eastern half of the country and when I go hunting out west they are day trips from a drop camp I wanted a pack that I could use packing in even though it may never happen. Because I don't pack in, I do not own or can really afford all the ultralight gear that the guys are using as frequent pack in hunters. The gear I have or can afford will not be as light or compact, so I chose the 5000. One of my buddies bought a K3, I think they were 3600 cu inches. His pack after he put all his puffy type of gear in it looked like a stuffed sausage. It amazes me what some of the guys on this forum can do with the smaller packs, but I don't live and hunt where I can become that proficient, so I went a little bigger to make up for Skill, and equipment. Again, I am not an expert, but I think you have to be honest about your capabilities/equipment and might have to make adjustments.