I packed knowing I was going to buy in shoes in Paris so only brought one pair of shoes with me which I wore on the flight over. I then alternated wearing new Islays with other pair while in Paris to help break them in. On the flight back I might have worn the Islays and carried the box in a shopping bag onto the plane. They never checked. It was a bit of a hassle but I was on an early flight out so there was no line and the refund was around $90.