Hello Cathy,
This is a great question. Over the past couple years, I have amassed quite the collection of MagicBands.
You'll be glad to know that if you have an
existing MagicBand, you may reuse it on future trips to Walt Disney World Resort as long as it is listed as "Active" in your My Disney Experience account and is in working order.
You also now have the option to decline a new MagicBand for an upcoming trip if you wish. To do this you will need to have an existing active MagicBand linked to your name. When the time comes to customize your new MagicBands, click the link to decline within the customize screen and follow the steps listed on the website.
Many people swap out MagicBands during a trip. I do recommend marking any MagicBands you don't plan to use as "Inactive" to avoid any technical issues.
Please let us know if you have any other questions as you plan, Cathy. Wishing you a pixie-dusted vacation!
Andrea U.