On the M90 about 3 cars in front of me someone’s roofbox popped open and all their clothes were distributed about the motorway. haven’t used mine since
That happened to someone I was following up the A30, pulled alongside, beeped the horn, finally got the drivers attention, kept pointing up, they just looked at me… I pulled forward, the next car did the same, the look on the guys face when he realised was a picture…
As a side note, I’ve never used one, but I was surprised it was essentially a suitcase on the roof, I always thought you’d chuck another bag inside.