How to ship these massive boxes?

flynnibus · 2017-08-31T23:33:28.000Z

Pardon if this is a FAQ type subject.. didn't see anything in my searches. Specifically in the US... what do you guys do for handling these huge Lego boxes when selling new or used sets? I keep all my boxes, but I find shipping them would just be kind of crazy in costs in terms of finding properly sized boxes and of course the added postage. Contrast with putting the bags in a USPS Flat Rate box and accepting the lesser value of the set. What's the general approach here? Obviously new sets are a bigger issue. What do you US sellers do to make it viable to ship these massive boxes?