When I flew to London for the Dun Run in July, I used the B Bag. I had tried to fit the bike in a big (hard) Samsonite suitcase, but it didn't quite fit. Feeling that the B Bag doesn't offer enough protection, I lined the sides of the case with two layers of heavy-duty cardboard, and the ends and top with a single layer. The bottom of the case is reinforced. As a further precaution, I removed the pedals and the clamps and screws used lock the hinges. I was pretty sure that the somewhat flimsy plastic hardware used to attach the straps to the bag would certainly be destroyed or torn off, but both the bag and the bike survived the trip absolutely intact. Maybe I was lucky.