I was just curious as I have the same pack. When the family goes to Walt Disney World I carry it for all the goodies and hang extra water bottles on the outside. I can pack pretty well, but if you got all of that in there I was going to be amazed.

I have a big BOB that is full of "modules". Each one adds to the comfort level of the user. The base or Oh S--t Bag (OSB) is really all that is needed, but the rest really makes things easier. The OSB comes out of the BOB and is attached via MOLLE to allow more room in the BOB for food and "Mission Specific" needs. (weather, special needs etc.)