Once you have the shipping label, just fill your old Amazon box (es) with stuff you want to donate, pack it up, and drop it off at your local USPS or UPS office.

Pack Your Box: Fill the box with clothing, accessories and household goods you no longer need and print your free shipping label from GiveBackBox.com.

Amazon Locker: Box and label required (with extra shipping cost) UPS Pick up: Box required, no label required (with extra shipping cost–the most expensive option) ...

If you know what to look for, the label can answer questions like, why did this package take so long to arrive, and who broke what's inside?