Big plug for both Crateworks corrugated plastic boxes, and Bike Flights. We've got out trips down to a science: Disassemble, pack and ship bikes—with Bike Flights—along with whatever camping gear we can fit into the box, to our kick-off motel about a week before the start of our ride (no one's ever said "no.") If it's a round-trip, we get the motel to store the empty boxes; if it's a point-to-point trip, we ship the boxes to the endpoint motel, and then take the bikes apart, pack them, drag them down to the front desk, and call for a pickup the next morning as we fly home. My big innovation is to print all the Bike Flight labels for all legs of the trip at once, and tape them to the bike boxes in a stack, peeling off the label for each shipping leg as it's completed. (This saves the trouble of hunting down a computer and printer, which can sometimes be a challenge in the bargain motels we always seem to end up at.)
My CrateWorks boxes have lasted decades, 2-3 trips a year. They get pretty beat up, but they still do the job. I only last summer finally bought a whole new one, after about 20 years of use. Not bad for a couple of hundred bucks.