The Pen-Pal Exchange Kit
The PostKid plan for running a child's pen-pal mail, at home or for a whole class: safe addresses, letters that mail at the letter price, and a calendar that fits the school year
PostKid's free Envelope & Paper Size tool finds the envelope a folded sheet fits, and the Postage and Stamp Quantity calculators ask you which class of mail it is. But the envelope decides the class: its size, its shape and what is inside it. The Mail Delivery Time estimator answers one way, while a pen-pal exchange is a round trip. The tools never meet, and a class multiplies every mistake by the number of children. This kit, written for parents and teachers, joins them. A Letter sheet mailed flat pays $1.69 as a large envelope; folded in three it is a $0.82 letter. A square card or a taped coin adds a $0.49 surcharge, and a friendship bracelet can make a letter a parcel. In the worked example, 24 letters abroad at $1.75 each are $42.00, while one large envelope between two schools is $8.75, and no child's home address goes on anything. Waiting for each reply abroad fits 3 exchanges into a 30-week season at the slow end; posting every four weeks fits 7. Step 1 is the safety frame: letters travel between adults' addresses, first names only, an adult reads every letter, pen pals never meet, and any call is booked by the adults. Prices are USPS retail prices effective July 12, 2026, so check the current rate before you buy; worked figures are examples, computed by the site's own calculators. 23 printable pages: seven steps, an exchange plan, an envelope check, a class mail log, a USPS price card and a quickstart, plus a personalised sheet worked from the settings you entered in the calculator you came from.
What’s inside
- The Adult's-Address Rule: school, program or parent addresses, first names only, adults read every letter, no meeting and no moving to apps
- The Fold-to-a-Letter Rule: which folds mail at the letter price, and what a flat sheet costs as a large envelope
- The Flat-and-Bendy Rule: what a square card, a taped coin or a friendship bracelet does to the class and the price
- The Forever Rule: sheets per ounce by paper weight, and paying with the stamps you already have
- The Calendar Rule: the round trip at the slow end, and why posting every four weeks beats waiting for replies
- The One-Envelope Rule: a class's letters in one large envelope between two schools, priced by class size and season
- The Adults-Book-It Rule: waking and school-hours call windows on both clocks, booked and supervised by adults
- An exchange plan, an envelope check and a class mail log to print, first names or class codes only
- A USPS price card (July 12, 2026) with the letter, large-envelope and postcard size classes
- A personalised sheet: your envelope and the price it decides, your stamps, your round trip and posting calendar, and your call window
Run one of the free calculators first and buy from that page, and this sheet is computed from your own figures. Buy from here and the pack still arrives complete — the sheet simply has no numbers of yours to work from yet.
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$19.00 including any taxes · PDF, 23 pages · instant download, link valid 7 days and 5 downloads.
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