I had never seen the Surly Big Dummy before--pretty interesting but the bags could extend farther forward and be a lot bigger without much worry for heel-strike, i think. it actually looks like it would be kind of fun to ride. Ad front panniers and a shelf and you could haul a Lot of stuff---even bulky stuff. I might be tempted to make some front bags which could each hold 48 rolls of toilet paper---weight would be low enough.