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Create a treasure trove of letters for your true-blue bff. Simply fill in the blanks on eight situation-specific missives, seal them in their corresponding envelopes, and present the whole package in its keepsake box. The letters can then be opened at just the right moment in the future to provide your personal thoughts and encouragement. Knock Knock is an independent maker of clever gifts and books. Our crackerjack in-house team creates humorous nonfiction and specialty journals from the ground up. We also publish new titles from outside authors, bloggers, and other creative types.