When I'm at home I use a double edged safety razor to shave. TSA won't let me fly with safety razors, so when I travel I use a Mach 3 razor.
My problem is that when I open a package of Mach 3 razors and use them only for my relatively infrequent travels (mostly short business overnights, some longer vacation travel), the whole package is oxidized and dull by the time I make a second trip so I waste most of the package.
I've looked for individually packaged razors but have only found cheap disposables in bulk packs of 500.
What's a good way to keep travel razors around without them getting dull before they're ever used?