When I travel I pack my Brompton in a Pelican model 1640 case. This thing is bomb proof and the eight times I have traveled with it the bike arrived in perfect condition. Some airlines have dinged me for the size and weight but most do not. The curb side guys are most fussy about size and weight so avoid them. The case is heavy weighing 34 pounds (16kg) but it is very tough, thus the total travel weight with bike is around 60 lbs (27kg).