Well, I got both the Therm-a-rest and the Travelon. I took the Travelon with me, and it was fine. I'm glad I didn't take the Therm-a-rest...it would never have fit in the seat. I was on an AA 787 in economy and boy, are those seats narrow. I was also in a bulkhead seat, which made the seat even narrower. The Travelon just barely fit. There is zero chance the Therm-a-rest would have ever fit.