I need some help finding a backpack. My old REI Greatstar just isn't big enough anymore. I actually am into lightweight backpacking and the last time that my wife and I did a week-long trip our packs, including food and water, weighed 20 pounds each. However, I now have 4 kids. So, my wife carries the new baby on her front, the toddler on her back, and I carry gear for 6 people.

I need help finding the best solution to carrying gear for 6 people. I've been looking into most of the standard packs at REI but I'm not satisfied with them for a couple of reasons. First, I'm a big guy and it seems waist belts are made in only one size most of the time. Second, most of these packs aren't taking into consideration that they will have to have 5 sleeping bags, a tent, 5 sleeping pads, extra clothes for the kids, about 3 days supply of diapers for 2 kids, food for 6, water for 6....... In other words, they either aren't big enough or not comfortable enough once I get 50-60 pounds of gear in them.

Does anyone have any suggestions?