This is an incredibly sweet idea. "Open when you need to know how much I love you; open when you don't feel beautiful; open when you need a laugh; open when you miss me; open when you're mad at me; open when you need a date night, etc.
GREAT birthday idea that could be used for any age! Instead of buying him just one gift, I decided to get him 12 gifts which he has to open every hour as of 31 minutes because he turns 31 years old. He gets to enjoy his birthday the entire day :)