Self-addressed (adjective)

Having one's own address written on it, as a letter or an envelope.

Origin:

Combination of self and addressed, meaning an object or an envelope that has one's own address written on it.

Examples:

1. Please send me the reply to this letter in a self-addressed stamped envelope.
2. The application form should be returned in a self-addressed envelope.
3. The package must be sent with a self-addressed label.
4. She wrote her name and address on the self-addressed postcard.
5. He sent the letter with a self-addressed stamped envelope for the reply.