It isn't bad. You can easily zip-tie it shut but that just begs the TSA to tear through it.
I don't fly with dive gear anymore, I like my own but its really dialed in for California. I really can't imagine flying anywhere but Seattle and San Diego that I might want it, and SD is getting awful warm for the dry suit.
They claim 11lbs. It is not light. Its sturdy and padded. Does 11lbs blow most airlines limits right off the bat?