Having a rack, a bungee cord bundle is the most convenient in my opinion. Instead of the rack I have an alternative that works really well but which you don't see often. I put some straps and hooks on the bottom of a light-weight draw-string style backpack which I utilize as a frame bag. two straps go around the seatpost, high and low. The drawstring loops around the head tube, around the top tube and latches. A velcro strap in the middle of the pack fastens over the top tube. On or off in about 20 seconds, out of the way and no rack needed. It works for me.