I just packed two frame set, in different boxes, of course. One is a 48cm, on its way from Canada to Texas, and it fit into a cut down bicycle box, that measured 38"x21"x8" and weight about 16lb - International Expedited shipping will be about $75.00 USD. The second box measures 36"x24"x9" and weighs 17lb. That one is going to New York at a cost of about $63.00. I also add on a $15.00 handling fee to cover selling and packing expenses.

Shorten the box as much as you can. Lower the height, as much as you can. Leave the width alone, it is too much work to reduce width, height and length, just height and length will do the job.

Hope this is a help.