Opinion: Millions of Americans can save thousands of dollars by doing this one thing

More than a decade ago, our family moved from a five-bedroom home in Florida to a two-bedroom apartment in New York City. As much as we tried to downsize in advance of our new life, we just had too much stuff.

So, we did what millions of Americans do: We put the excess in storage. And then we spent years ignoring the costly reality, racking up thousands of dollars in locker-rental fees as a result.

Our…