If you purchased a Packlink shipping label through Reverb and you will not be using it, you can cancel the label in your Packlink account. 

1. Log into your Packlink account and look up the label under the “Ready For Shipping” tab.
2. Click on the shipment you want to cancel.
3. Click on the “Cancel Shipping Label” button on the right side.

It can take a few days for the status on the label to be updated, but you will not be charged for the label if you cancel and it hasn’t been used.