Originally Posted by
old's'cool
A bit off-topic but might a large frame bag meet your needs? I have the Ibera large size and it is great for fitting to the bike of the day when I need to carry incidental cargo. E.g. when riding to the pub, I carry my lock, flip flops, wallet, phone etc. in it.
+1 on the frame bag idea. I have a new Revelate Designs tangle frame bag that has made my commute much nicer. I carry my lock, keys, sunglasses (before sunrise winter commutes), gym shorts, really anything I can stuff in there. Lunch and clothes are still in a backpack, but it is a much lighter backpack