So I bought a new road bike and am enjoying the heck out of it. It's sort of become my commuter - I only bought it 11 days ago so I've been riding it every chance I get and that includes commuting.

I know there are plenty of folks here who commute on their road bike so I thought I would try to glean wisdom from the collective. Does anyone know of a handlebar bag that's 12" x 7" x 7" that I can carry my work clothes in and also can be quickly and completely removed (not leaving any mounting clamps on the bars)? The reason I want it to not leave any clamps is purely one of appearance - I think the bike looks better on the weekend group rides without clamps on the bars.

I was originally thinking about using a quick-release seatpost rack but the carbon seatpost seems like a bad combination with a rack - even if I only have 2-3 pounds of clothes to carry (plus the weight of the bag plus the weight of the rack - probably about 6 lbs. hanging off the seatpost) it just strikes me as a bad idea - the carbon of the seatpost is probably woven to handle only compression from the weight of the rider and not squeezing from a rack. I assume my thinking is sound on not using a seatpost rack?