Tucked between the turkey sandwich and the apple chips, we like to think that every child finds something sweet. (Besides the mini bag of Peanut M&Ms, of course.)

The lunchbox note has been a staple of cafeteria correspondence since PB met J. It has served as a pick-me-up, a reminder, a pep talk and a hug replacement. It makes a great day even better, and makes a bad day just a little more tolerable. It is, like any note, a small gesture to let someone know you’re thinking about him or her.

But writing a lunchbox note isn’t as easy as scribbling a few x’s and o’s. Like all handwritten sentiments, there is an art to perfectly crafted communication. Here are our tips on how to make sure yours isn’t tossed out with the empty juice box.

• Keep it short and sweet. Lunchtime is about re-fueling, but it’s also about socializing with friends. Between conversations about homework and weekend adventures, your child has about 30 seconds for reading. Keep it to 1-3 sentences (this isn’t the time to reminisce or tell a story) and keep it light and loving (this also isn’t the time to remind him he needs to clean his room tonight).
• Don’t use the good stuff. Now isn’t the time to utilize your engraved monogram stationery with lined envelopes. Not that a note to your child isn’t special, but there is a good chance that it will come home decorated in apple juice and peanut butter (if it comes home at all). Instead, invest in a notepad or box of notecards reserved only for your note to your child. This way, he’ll know it’s from you to him (and feel special because of it), and you won’t be upset about your monogram getting trampled in the hallway between classes.
• The delight is in the details. “I love you” and “Have a great day” are certainly lovely sentiments, but chances are you tell them to your child on a daily basis. Every note should touch on specifics. Mention a funny line from a movie you both love, tell her how much you love her new red sneakers or suggest you both get frozen yogurt after school. Whatever it is, make sure it gets a smile.
• Everything in moderation. Like an extra cookie, a lunchbox note is meant to be a surprise treat. They should be sporadic, inspiring smiles, not groans. Sure, including one on Valentine’s Day or on the day of a big test is lovely. But it’s those not-particularly-interesting-in-any-way-days that make an unexpected note quite a delight.

Need more correspondence advice? Email our Crane Concierge at concierge@crane.com.