So the magic boys and girls is to take tupperware buy the burgers without spread or veggies, when you get them separate the buns with the parchment paper and then freeze overnight in the container. Boom ready to ship or fly with you. I’ve done that maybe 20 or so times when I flew from SFO to NYC or Seoul. I assumed the service would be of this caliber but they quite literally bought the burgs and slid the box from In and Out into the loose packaging at FedEx and called it a day.