I took the Trek out today. One of the last sunny weekends before autumn kicks in. I used my Ortlieb Shopper which snaps on and off and turns into a tote or shoulder bag. Waterproof too. I got it from Velorution where I also brought the Zip City bag. I wanted something I could take off quickly when I parked the bike. The all black colour works very well. Once when I was in the West End someone asked me where I got the bag, not realising it was a bike pannier.