Sometimes I like to think about what I would do without certain practical limitations. For example, if I could comfortably carry a larger amount of gear/equipment on me would I do it? Let me explain, I live near a university and its pretty common to see people carrying backpacks really its common anywhere in the valley and no one would even give it a second thought (It would probably draw less attention than a fanny pack or "Tactical" messenger bag).
This got me thinking, lets say I could find the PERFECT backpack, small light, with a non military look and used that to carry gear/equipment? When I say small I"m talking close to the size of a US army hydration pack, so maybe 16"x2"6" for the bag. Would that extra space be useful for every day carry of extra gear?
Now that I've explained my train of thought, let me as the question. If you had a backpack that was perfectly comfortable (I'm not sure if one exists, so this is purely hypothetical) and would allow you to carry extra gear in a space as large as 16"x2"x6" what would you carry for every day use?