There are two large latches on the front of the case that secure it shut. There's a place for a lock, if that's something you want to use to protect your pens.
So, how does it fly? On both ends of my trip, the pens didn't leak, creep, or change at all. It was like carrying pens with me in the car. Brilliant. I really don't know what else there is to say about it – it makes flying with fountain pens anxiety-free. I don't have to worry about the pens leaking ink in my bag, and it also protects the pens when they're packed tightly in my bag. Perfect solution for me.
Of course, you may not care about moving to a ridiculous travel setup like this – it's not ideal because of the size, I'll be the first to admit. But, owning multiple fountain pens and inks isn't really practical either. It's all about the hobby and enjoying the experience of writing with fine instruments. And, for me, the ability to pack pens on a plane without having to think about ink leaking is a worth the price of admission, dorky box and all. At any rate, this case also protects it from the trip – think about all the times your checked bag might get tossed, dropped, kicked, etc.
If you want to buy your own fountain pen travel case, Amazon has them for a pretty fair price of about $22.