Neither of my gig bags fit: Mono M80 & Protec Contego - I managed to get the M80 in, just, after removing all the foam from the bass case interior.
I used a padlock through the clasp on the old version but on the only time I flew with this case the padlock, which was quite exposed, broke and the clasp came undone. I replaced the bass case with the later version with a strap around the blunt end which easily comes undone and there is no way to secure it, so much so I didn't ever dare fly with it.