A little letter goes a long way.
The Little Letter Box is our most-loved kids letter writing kit — a complete snail mail kit with everything a young writer needs to send some happy mail to the people they love most. No screens, no instructions to figure out, just a slow afternoon at the table and a letter going somewhere it's truly wanted.
A favorite gift from grandparents, aunts, and the moms who get it.
What's inside
- 10 pages of fun, double-sided lined stationery
- 10 guided brown craft envelopes
- 1 sheet (30 stickers) of personalized return address labels
- 1 handmade mini address book
- 6 sticker sheetS
- 5 wax seal stickers
- 1 six-in-one multicolor pen
- 1 self-inking fun stamp
- 1 "How to send a letter" instruction card with letter writing prompts and ideas
- Postage Stamp envelope to keep them safe and separate
- OPTIONAL - add Forever postage stamps (so the first letter is ready to mail!)
Mailing tip: Our wax seal stickers are thin and flexible, and letters sealed with them almost always mail just fine with a regular stamp. Once in a while, the post office may ask for a little extra postage for a sealed letter. If you want to be extra careful, add an extra stamp or ask for hand-canceling at the counter. Or just use them for journaling or hand-delivered letters!
Pick your stationery theme
Classic Pink, Classic Blue, Classic Green, Animal Mail, Dino Discovery, Magical Creatures, or Back-to-School (limited time!) — seven ways to build their perfect pen pal kit.
Personalize it!
Upgrade your stationery and add their name to the top of every stationery page for a personalized touch.
Pick your box color
Choose between 5 colors for the zipper box - Pink, Blue, Green, Purple, and Yellow. Mix and match your favorite stationery theme and favorite box color!
Best for ages 5 to 15. Packed by hand in California. Ships within 3 business days.
🏡 Homeschooling? Make your Little Letter Box an even richer learning experience!
Coming August 2026
Looking for a little more structure? Our optional homeschool curriculum add-ons are designed to turn your Little Letter Box into a meaningful writing enrichment experience.
Choose from four themed digital lesson plans ($5 each, or $15 bundle):
- ❤️ Kindness Mail
- 🧒 Family Connection
- 🌎 Mail Around the World
- ⏳ Time Capsule
Each lesson includes guided activities, writing prompts, discussion questions, optional field trip ideas, and standards-supported learning opportunities. Best of all, every lesson includes adaptations for Kindergarten–1st, 2nd–3rd, 4th–5th, and 6th+ grades, making them perfect for homeschooling families with children of different ages learning together.
Visit our Homeschool Resources page for more details, and to explore available add-ons, curriculum options, and ideas for incorporating letter writing into your homeschool routine.
Our promise: if anything about your order isn't right, we'll make it right — a replacement, refund, or store credit, your call. Just write to us.
📬 Keep the magic going with the Heartpost Letter Club
Love the Little Letter Box? Our monthly mail subscription turns it into a year of adventures. Every month, a bundle arrives addressed to your child — a personal letter from Pip the carrier pigeon, a new story chapter, fun collectibles, and a complete snail mail kit to write and send two real letters (postage stamps included). Optional Adventure Guide for an even deeper dive and for homeschool families including these into their monthly learning plans. $18.99/month, shipping included.
Meet Pip & explore the Mail Club →💌 Never run out of happy mail
When the paper and envelopes run low, our refill Stationery Set brings the magic back — no box required. Subscribe & save 15% and fresh themed refills arrive on your schedule (every 1, 2, or 3 months). Pause or cancel anytime.
Set up refills & save 15% →