Tip: If you’re wondering how to measure whether your letter is at least 0.007 inches thick, simply compare it to an index card or postcard. (To find the aspect ratio of your letter, simply divide the length by the height.) While mailings that fall out of these aspect ratios (including square envelopes) count as “letters,” they are subject to non-machinable surcharges. Standard letters are rectangular with an aspect ratio of less than 1.3 and more than 2.5. No more than 6 ⅛ inches high x 11 ½ inches long x ¼- inch thick.At least 3 ½ inches x 5 inches x 0.007 inches thick.To help you visualize what we discuss below, here’s a
USPS has three main categories of mailings, defined by the shape, size, and weight of a shipment. USPS-friendly and eco-friendly mailers from EcoEnclose.Minimum packaging standards for each shipment category.Categories of shipments-what qualifies as a letter versus a flat versus a parcel.These are all updated according to the latest regulations as of July 2023. To share what we’ve learned, we’ve broken down some of the most important things to know regarding packaging for USPS based on our research and experiences. These can be confusing unless you have hours to dig through their website, and who has time for that? Lucky for you, we did.
Over the years of partnering with USPS, we’ve learned much about how to package things effectively, the best mailer sizes, and the mailers to avoid.Īs with any shipper, USPS has many service options and packaging requirements. Besides offering great services, their pricing for our samples and smaller orders is hard to beat. For many, USPS presents the cheapest option, especially for those who primarily ship lightweight, similarly sized items.ĮcoEnclose is proud to work with USPS for many of our shipments. Businesses typically choose between three main shipping partners-USPS, UPS, or FedEx.
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