The two-ounce stamp exists for one reason: to price a heavier letter correctly with a single stamp, instead of clustering Forever stamps until the total is high enough.
Most offices do not stock them, and most offices overpay on heavy mail as a result.
What it is
A two-ounce stamp carries no printed dollar value. It is marked with its usage — "Two Ounce" — and stays valid for the two-ounce rate indefinitely, exactly the way a Forever stamp stays valid for the one-ounce rate.
It is not a Forever stamp and it is not a collectible curiosity. It is the correct denomination for a specific, extremely common weight band.
When you need one
Any letter that crosses one ounce. In practice that means:
- An invitation with a reply card and a reply envelope
- A multi-page contract or statement with inserts
- Anything on heavy stock — invitations and announcements especially
- A letter with a small enclosure
The one-ounce threshold is thinner than people expect. A few extra sheets or a single heavier insert crosses it, and once crossed, one Forever stamp is short-paid and the piece comes back.
Why not just use two Forever stamps
Because it costs more, and because it looks like what it is.
The two-ounce rate is not double the one-ounce rate. Stacking two Forever stamps overshoots it, and on a run of any size that overshoot is money spent for nothing. Where the excess is small, an additional-ounce stamp alongside a Forever stamp is the cheaper correct answer.
There is also the envelope itself. Two or three stamps crowded into a corner reads as improvised — which for an invitation or a client-facing document is the wrong impression.
Best deals on Forever stamps
Weight and shape are separate problems
Worth stating plainly, because it is where the arithmetic most often goes wrong.
A two-ounce stamp solves weight. It does not solve shape. A square or rigid envelope is non-machineable and needs the non-machineable surcharge regardless of what it weighs — and a heavy square invitation needs both.
Weigh a fully assembled piece and check its shape before buying postage for the run. Current figures are in the USPS Notice 123 charts.
| Situation | Correct stamp |
|---|---|
| Plain letter under 1 oz | Forever |
| Letter just over 1 oz | Forever + additional-ounce |
| Letter up to 2 oz | Two-ounce |
| Square or rigid, any weight | Non-machineable surcharge |
Buying them
Two-ounce stamps are ordinary stock. Buy from a supplier who issues a commercial invoice from a verifiable US business address, and check on arrival that what arrived is actually marked "Two Ounce" — mislabelled standard Forever stock produces a mailing that is short-paid on every single piece.
Genuine secondary-market sourcing supports roughly 10–20% off. Beyond that, genuine phosphor tagging is missing and sorting equipment pulls the piece rather than delaying it. Buy ahead of rate rises; like Forever stamps, these hold their value. Changes are published by the Postal Regulatory Commission, and service alerts cover disruptions worth planning around.
Where to buy
The USPS official store, or a specialist such as Forever Stamp Center that stocks two-ounce, additional-ounce and non-machineable alongside standard Forever. For an urgent local top-up, the USPS location finder.
More on buying Forever stamps
- 👉 The Paper That Grows: Why My "Green" Wedding Invitations Almost Molded in the Mail
- 👉 The Flexibility of the Physical: Why Stamps Remain the Best Option for Low-Volume Sellers
- 👉 USPS Business Stamp Account Discount: A Guide to Compliance and Rules
Stamp enthusiast and part‑time columnist based in Los Angeles. With a background in office administration and a personal passion for collecting Forever Stamps, she provides readers with practical tips on buying, storing, and using stamps effectively.
