With respect Danny this is a bag for transporting your fishing tackle at most a mile or two down the bank, it's not something you would wear to yomp across Dartmoor and while it may not be the most comfortable of bags (It hangs a little low on the back) it is a pretty good compromise, especially when used with a chair.
The comment about the weight is irrelevant as you will be carrying a chair anyway, also it is so simple to work out how to attach it that when my Mrs (who doesn't have a degree) gave me mine for Christmas she said, "I've tried it with your chairs (I have two, one low back and one with arms, neither of them are Korum) and they both fit".