-
Pipe lagging you put into a smaller bag and carry with otherwise how are you going to protect your frame on the way back?
If you really want to you keep the pipe lagging in the bike bag when you roll or up, even with them it's still significantly smaller than a hardcase.
I'll take a bike bag and pipe lagging over a hard case every journey, it's just easier to lug around, my tip if you don't want to carry the bike bag everywhere, get a small foldable metal trolley, some bungee cords and strap bike bag to that, you get to wheel it when you need to and carry when you don't.
-
There has been some anecdotal reporting of baggage handlers taking more care of a soft bag, rather than simply frisbeeing it out of the hold as they do with everything else.
Hard solid case = tough, thereforth doesn't need care.
I occasionally box/unbox customer's road bike that they return from a trip, the hard case always show sign of abused (one was even cracked but bike is still safe), but the cardboard box show little abused.
Having said that, both bike still in good condition, well apart from the wear and tear they put their bike under during the trip.
There has been some anecdotal reporting of baggage handlers taking more care of a soft bag, rather than simply frisbeeing it out of the hold as they do with everything else.
Pipelagging would be an option, but having to do something with it afterward kind of goes against the principal of the bag - unless you shove the pipe lagging in the bin at the airport I suppose.