A little letter goes a long way.
The Little Letter Box is our most-loved kids letter writing kit. Tucked inside is everything a small writer needs to send some happy mail to those they love most. A multicolor pen for picking the perfect color, or 5. A handmade mini address book to keep their favorite people close. Wax seal stickers, themed stickers for decorating, and a sheet of personalized return address labels.
No screens. No instructions to figure out. Just a slow afternoon at the kitchen table, a little tongue stuck out in concentration, and a letter going somewhere it's truly wanted.
A favorite gift from grandparents, aunts, and the moms who get it.
Ready to write and ready to send
Every box is a complete snail mail kit, with 2 USPS Forever stamps tucked inside — so the moment they finish their first letter, it's ready for the mailbox. No extra trips, no hunting for stamps. Just write, seal, and send.
What's inside
- 10 pages of fun, double-sided lined stationery
- 10 guided brown craft envelopes
- 2 USPS Forever stamps (so the first letter is ready to mail)
- 1 sheet (30 stickers) of personalized return address labels
- 1 handmade mini address book
- 2 themed sticker sheets for decorating
- 4 other fun letter, emoji, and happy mail 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
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!
Make it theirs: Basic, Personalized, or Deluxe
- Basic — the complete kit in our standard zipper box: durable, fun, and perfect for tucking into a backpack or bookshelf. No name printing on the stationery.
- Personalized — everything in Basic, plus your child's name printed on every page of stationery.
- Deluxe Personalized — the personalized kit, upgraded to our Deluxe keepsake box: a larger, white textured premium cardboard box with a magnetic envelope-shaped closure. Made to be decorated — some of our littlest customers cover theirs in stickers and crayon doodles. The box becomes part of the gift.
Every kit — including Basic — comes with a sheet of 30 personalized return address labels printed with your child's name and address.
Pick your theme
Classic Pink, Classic Blue, Classic Green, Animal Mail, Dino Discovery, or Magical Creatures — six ways to build their perfect pen pal kit.
Best for ages 5 to 15
Packed by hand in California. Ships within 3 business days.
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 Mail 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). $19.99/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% →