What kind of material can act as storage, float and withstand firepower?

I actually rediscovered an old story I wrote five years ago and there was this supposedly synthetic material that can float, be programmed to be directed where to be delivered and can carry luggage (I'm assuming ~100kg) and can withstand firepower from the tumultuous society that's currently in civil unrest against a tyrant.

I'm wondering if anyone knows if something similar in reality could be incorporated even theoretically.

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What kind of material can act as storage, float and withstand firepower?

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