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If you REALLY care about space saving, a quart (TSA size) to gallon size zip-lock freezer bag. If you have room, and the stuff to fill it, a nice leather Dopp bag looks classy heading to the...

By car? Train? Airline (and if so, with checked baggage?)?

I gave up flying over 20 years ago, so it's not so critical. For space savings, I take a Palmolive shaving stick in a pill bottle that...