Look at me one way and I weigh a whole lot

Look at me one way and I weigh a whole lot

Look at me one way and I weigh a whole lot

Solve me this:

Look at me one way and I weigh a whole lot what am i

Look at me one way and I weigh a whole lot. Turn me around and you’ll see that I am not.

What am I?

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ANSWER

A ton.