First-Class Mail is a fast, low-cost way to send envelopes and postcards. See First-Class Mail and Forever stamp prices for a letter and postcard.

Learn about USPS First-Class Mail rates, delivery times, and postage discounts. Send letters, postcards, and small packages faster and cheaper with Stamps.com

Learn USPS envelope dimensions, letter size rules, and large envelope limits. Save time and postage costs when mailing letters and business items.

Quality Park Health Claim Insurance Envelopes, with Security Tint and First Class Border, for Medicare Form HCFA-1508 and other Healthcare Forms, 28 lb. White Wove, 100/Box …

A practical First-Class Mail® envelope guide: letter vs flat, weight and size limits, machinable vs nonmachinable, addressing tips, and how to choose the right envelope.

First-Class Mail is used to send envelopes containing bills, invoices, tax forms, correspondence, and more, as well as lightweight packages. You can send personal or business mail through …

Feb 27, 2024 · Learn about USPS First-Class Mail: An affordable option for sending letters and flat envelopes, including costs and key details.

Nov 3, 2025 · USPS First-Class Mail® is the go-to mailing option for sending letters, postcards, forms, and large envelopes quickly and affordably. It’s perfect for everyday correspondence …

Sep 27, 2024 · There are several different types of USPS First-Class Mail, including letters, postcards, large envelopes (flats), and small packages. Each type has specific size and weight …