I shipped a 25 inch frame Schwinn Voyageur to AK in a 108 inch box. It is all about the angle & your skills with a box cutter.

It sure wasn't easy though. I much prefer the lower 48 shipping with fedex ground.

I shipped a bike via Greyhound to a friend. They were hacks on the receiving end. They never called my friend to tell him the package was there. I told him what the bike box looked like and he had to go pick it out of their holding area after they denied they received it.