The only pack more comfortable than the Mchale I have tried was the (Jack) Stephenson, which had a custom external frame, and the same frame tubing forming arms which pivoted to wrap around the waist too. The belt 'floated' and rode easily up and down between you and the frame, perfection! Wish he still made 'em, I outgrew mine years ago..also the Stephenson pack design was the best for accessibility in terms of zipper shape (T-shape zippers) and compartment placement; you could get anywhere in the pack quickly. This is also the first pack that had the idea of accessing the (large) side pockets without removing the pack..
Unfortunately for me, most packs these days don't have such great accessibility, they all seem to be made for mountain climbers who need to put everything in one big sleek compartment, and not access it for a long while.. I like to dig stuff out along the trail all the time; binocs, water, food, hat, knife, camera, water filter, books, etc. etc. The backwards side pockets help, you don't even have to stop walking to get stuff..