Sometimes I make odradecks. The Odradeck was invented by Kafka, in a very short story, called "Cares of the Family Man". You should read it, it'll take about a minute, and it's available online. But, at any rate, my Odradecks are many, if each entirely different from each other; they are each a whole being made of scraps and bits and parts; brazed, soldered, hammered, welded together, then cut again into a mask form and, finally, sanded to a comfortable edge; unlike the story they spring from, a story which remains, just a bit, uncomfortable.
The wonder of a copper mask is in the strength and give of the material. Because it is so strong, the mask can be very thin- this makes it both very light, and makes it possible to fit as a second skin. These won't block your peripheral vision the way a leather. paper maiche, or plastic mask would. They can be very comfortably worn all day and night- no worries about sweat or rain causing them to soften and lose their shape. Rinse it with clean water at the end of the night before putting it away. All colours are created by carefully controlling heat and the metal's access to oxygen throughout the process and are both durable and archival. They can stand up to anything you throw at them. As for packing? Throw it in your bag. If you're checking the bag, maybe stuff a balled up pair of socks where your forehead would go. Easy.
Not planning to wear your mask? They won't mind. They can hang flat against a wall, or sit on a shelf.