I'm currently at the tail end of a multi-country jaunt (Qatar-UK-USA-Japan-Guam-Philippines-Guam-Japan-Australia) and based on my experience so far, have been super happy with the ShockCase, which I bought on Amazon for around 13 bucks. I love that they are small enough that I can strategically place them in the carry-on to maximize storage room. They have great padding inside and the case itself is sturdy so I don't worry about crushing my watches. I currently am travelling with 7 watches.
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