Things I learned from receiving my used QX100 from
@joy .
Pipe insulation is your friend - it fits over tubes nicely,
ziplock bags taped or twist tied to the frame or box so it can't move and cause damage. Separate bags for quick releases and small parts with a label included in each bag,
tape on anything you think might cause scratches, tape down all loose cables,
find/cut the appropriate length copper pipe or wood and fix between instead of the wheels,
either remove and/or capture chain inside a bag,
secure chain rings / crank to the frame with foam and tape,
double wafer cardboard folded around things like fork ends provides extra protection if the foam might simply be pierced.
You can always cut down the box if there is too much space.
disc brake rotors are more fragile / susceptible to bending than the gear cluster,
If the bike is in perfect condition before, ie. no scratches, then you may want to treat it like a new car and coat all the accessible surfaces with blue painters tape before disassembly just like new cars have that white vinyl to protect from paint chips in transit.
(Hydraulic brakes need a piece of wood or other hard substance between the brake pads to prevent them from pushing out and being very difficult to install afterwards)
I think it was
@super slim that described how he packed his Silvio for touring on a different continent, there might be some good tricks there but I can't remember what the thread was called.
Any other tricks from the gurus?