Originally Posted by eakirkwood

I use a Timbuk2 pannier/messenger bag combo. It is waterproof and is easy to take on and off. Mounting has been plenty secure for me, but I commute only on city streets. It is large enough to hold a change of clothes and my lunch for work. On Sat., it held a 12 pack of PBR, 1lb. of hamburger, hotdogs, and buns.