I gave it a test, the thread used that was sticking out lit up quickly and part of the zipper cloth started melting also but I didn't want to badly damage it because it is a good little document bag to be honest.
It has a strap to carry it on your luggage. The lock is okay.
The durability is a bit questionable, although the sides are actually fireproof as it is coated with something shiny. I slightly used a candle flame and it made me worry about the zipper, strap, and the lock. The zipper handle only turned black, I guess the fire wasn't strong enough as I didn't hold it there longer. I ran water on the zipper area, the water went inside the bag.