I left off using my trunk bag during my recent kid-seat era, and haven’t started again. The one I had was Avenir branded and seemed ok.
On my old steel roadies it would cause head shake when coasting downhill no-hands. Easily stopped, though
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."