A Note on the Back of a Photo, Sent by a Tourist
Puzzle 13 of Staying close Pack
Question is: A Note on the Back of a Photo, Sent by a Tourist
and the answer is: POSTCARD
Word Meaning:
POSTCARD — (postal) A rectangular piece of thick paper or thin cardboard, typically used for sending messages by mail without the need for an envelope.
Definitions from Wiktionary.