I just bought the Topeak MTX Trunk Bag DXP with side panniers along with the Topeak explorer rack. I got both for about $100 on Amazon, which seems like a good deal. The Trunk Bag by itself is advertised as $125 on REI's website. I ride a Kona Dew and have noticed that with most decent sized panniers there is some heel-kick unless I position them exactly right all the way in the rear of the rack. Right now I am using some smaller Trek panniers, but they are kind of a pain to fasten and have bounced completely off in traffic on two occasions now. Anyway, the trunk bag seems like a good option for the hybrid style bike and I like that it will be secure on the rack. Anybody else use this?

Happy commuting everybody