Has anyone here tried out combining a RIBZ pack with a technical lumbar pack instead of a pack for hot summer trips? Seems like it would be a cooler carry and would load balance really well. Perhaps a Mountainsmith Day lumbar pack at 13/14 liter capacity, and then a medium sized RIBZ pack for another 7 liters. Smallest I've tried to get my summer gear into was a 25 liter pack, but I'm tempted to try this out and see if I can make it work. Just looking for feedback if anyone has tried this or not.