I've got a couple of bikes with these on them:
OYB Luggage / The OYB 7-Way Bag!
He used to have a bike specific version that cost $45 if memory serves, but I'm not seeing that on his site at the moment. I like the top straps for tucking in a jacket if I get hot as the day goes on.
I also have something similar to what Chrome Molly posted above. Got mine from Velo Orange. I think they called it their Baguette Bag.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"