Originally Posted by vrkelley
Adding to previous tip; When you hear something fall off while you're in traffic, the first instinct is to stop suddenly or swerve (alarming those around you). When attaching an accessory, try to have a secondary strap or means of attaching the thing in case the first fails -- if possible.
Zip ties are great emergency fasteners. I try to keep one or two in my saddle bag at all times.