When I had to take my dress blues into work,I used one of these:
Nashbar Commuter Garment Pannier - Normal Shipping Ground
Requires a rack,but works quite well.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X
