Long-term Mac fans may well have a few of those MacBook "duckhead" charger adaptors lying around. Redditor patrik_niko discovered that these adaptors can actually plug into lots of different devices, allowing you to reduce the number of cables you have lying around.
Many AC bricks have two-pronged holes in them that fit perfectly with the duckhead adaptor. Just grab a spare one and see if your camera charger or other device snaps onto it! It's particularly useful for bricks that aren't very heavy.