Minimum packaging standards for each shipment category.Categories of shipments – what qualifies as a letter versus a flat versus a parcel.Here, we break down some of the most important things to know when it comes to packaging for USPS, based on our research and our own experiences. In our work with them, we’ve learned a lot about how to package things up – what mailer size to use, which ones to avoid.Īs with any shipper, USPS has a myriad of different service options and packaging requirements, some of which are confusing to understand unless you have hours to dig into their website. We have found that their pricing is hard to beat for our sample and smaller orders, and that they are great to work with. For many (especially those who ship a lot of lightweights similarly sized and shaped items), USPS is the cheapest option.ĮcoEnclose is proud to work with USPS on many of our shipments.

USPS Services and Packaging Requirements | What To Knowīusinesses typically have three shipping partners to choose from - USPS, UPS, and FedEx.

Priority mail flat rate envelope rules