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Nope, they're not. And they're cheap enough that it doesn't hurt until you realize that buying one here, three there, etc. adds up! Plus, they're harder to hide from your wife than razors. :w
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I probably have about 30 or so soaps now- much to my wife's dismay;) . If they don't come with their own container, I use the XS ziploc or glad (I can't remember which) round plastic bowls, as Ilija...