You're 2 seconds from losing all but one of your worldly posessions.

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Which one would you save? It can only be one thing. So, you can't take a box of animal crackers, but rather, only one animal cracker (should you so choose, ya minimalist wacko). If you can't take it apart without applying reasonable amounts of force, then you can take it. It can't be anything that you can't pick up, like a car. It can't be some sort of inter-dimensional vessel that allows you to get your stuff back.