On a 600k a while back, I had an outer jersey bungee corded onto the top of my trunk bag. I had other riders tell me, beware, it was about to get entangled, but for the life of me, I couldn't get it bungeed where something wasn't hanging down. I eventually moved to on top of the handlebar bag and that fixed it.
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"be careful this rando stuff is addictive and dan's the 'pusher'."