I've gone and done it. I've purchased a Joey's bag. For those not familiar with the phrase, it come's from the Friends episode where Joey gets very attached to his man-purse. However since neither Andrew nor I are going around carrying something called a man-purse we refer to them as a Joey's bag.
The thing is that my camelback that I've been using to carry stuff on my motorcycle doesn't have enough space for everything I want to bring around. It's not really designed for bike travel. And it's not very stylish on my leather jacket. With neither classical nor romantic Quality I've decided it's probably time to find something better.
And the REI catalog this month had a good recomendation. They've got a new messengers bag for bicycle travel that works remarkably well for motorcycle travel as well. It's well balanced and affixes nicely to my back so it's not shifting anywhere in a turn. I just hope I don't need to make use of the water-proofed zippers it's got.