Yesterday I went to Hebden Bridge and back for Physio. Using kiwi I had strapped a bag on the rack to keep weight off my back. The first hill on the way back and something went into my wheel, stopping and looking round the bag was in the middle of the road. The bungy cord was completely wrapped round the freewheel (I was lucky it didn't go into the fixed side). After resucing the bag, I set about freeing the wheel, eventually using the screwdriver on the multi-tool to cut the cord a strand at a time. It took ages but at least I was able to pedal again. I guess this means I need a racktop bag for when i'm not carrying much?