I have been cycling around London with two bags because I have been shopping. The bag hanging from the handle bar is a folding shoulder bag by Muji. When folded it goes into a pouch which I pop into my main bag. In the photo above the bag is carrying a pair of ankle boots which I got from Office this week. I am not keeping them because they are too big. I find it easy to sling both bags over my back when changing trains but when I am cycling I strap the Timbuk 2 bag on the rack and carry the Muji bag on my back.