You would think that they would be completely safe that way, right? I sent a driveshaft via UPS one time. Slid it into a PVC sewer pipe and even capped the ends with PVC. Not only did UPS break the sewer pipe, but, bent the driveshaft at about a 30 degree angle! So much for my most bulletproof package I ever made. And yet, I've received a huge wraparound back glass just wrapped (poorly) in a blanket and tied on with twine. All 4 corners were sticking out of the blanket, and it came through without a scratch. You just never know.
