Got a carrdice SQR bag here too – the Tour Slim (might be called something different now). Very hand for commuting, built for 10kgs and 16 litres inside, but it forms a shelf so you can bungee stuff to the top as well. Quick to fit and detatch, too (like 1 or 2 seconds). Streamlined position into the wind.

Just recently got a Wildcat frame bag and seat pack for off roadery rides, and for a more balanced, lighter, one or the other or both type approach, for road rides too. Nice to have the zip for the frame bag at the front so that you can have something accessible on the move – snacks, phone, camera… Still use the caradice for commuting – folded shirt and occasional laptop.
