Yeah. I always have a padded envelope with stamps in and addresses to myself, just in case.

How to Address an Envelope in Care of Someone Else

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Use bubble mailers to protect your deliveries. The interior is lined with bubble wrap to add cushioning and protection. Available in laminated kraft

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How to Send an S.A.S.E. (Self Addressed Stamped Envelope)

Can you write on the back of an envelope? - Quora

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How Many Stamps for a Bubble Mailer? A Full Guide - Postagestampsdeals

How to Send a Letter or Postcard

How Many Stamps to Mail a Padded Envelope? - The Boxery Blog, Packaging & Box Tips