We pack bikes for travel here. It's not our most requested service (that would be flat tire fixes), but we probably box up 3-4 bikes a month. Bikes get boxed for shipping, for going on airplanes as checked luggage, in moving trucks, or on Amtrak (I hear the rates are reasonable). You can buy bike specific bags and boxes, but unless you're going to do multiple trips it usually makes the most sense to pack in a regular ol' bike box. They're the boxes that bikes get shipped from the factory in- they're sturdy enough that if they're handled with reasonable care you can get a use or three out of them.
This particular box is super sturdy. It must have been in a batch of particularly well made ones. It first contained a new bike that was shipped to a shop in Portland, OR. That's where my buddy, Mr. E picked it up to pack his bikes for a move to Texas. Where I grabbed it from him to bring the Brown Machine back after my winter adventure. It's now going on a moving truck, headed for who knows where (probably the person moving, that's who). It's still in wicked good shape, so I hope it gets passed on for another journey.