USPS flat rate box - large (12 x 12 x 5.5 in).USPS flat rate box - medium shallow (11.9 x 3.4 x 13.6 in).USPS flat rate box - medium (11 x 8.5 x 5.5 in).USPS flat rate box - small (8.6 x 5.4 x 1.6 in).USPS offers the following selection of Priority Mail Flat Rate packages: If you use a package that matches the dimensions, but the package isn't provided by the carrier, then your package doesn't qualify for special rates or services. These packages can be acquired from the carriers directly.

Carrier packagesĬarrier packages are shipping packages available from the carrier with markings indicating that they qualify for special rates or services. For more information, see Parcel Services Shipping to the U.S.A. If you are using Canada Post to ship internationally and you don't see shipping rates being displayed when fulfilling an order, then your packaging might not meet the requirements defined by Canada Post. If your store is based in Canada, then visit Canada Post's packaging best practices guide for more packaging tips. The Domestic Flat Rate Variety Pack includes small (1), medium (2), and large (1) boxes, which you can use to ship both domestic and international orders. You can also request a free USPS shipping kit to get you started. If your store is based in the United States, then you can use USPS flat rate packaging. These packages are not priced by size or weight, but rather a pre-determined package size and shipping speed that you've chosen from your carrier's available options. Flat rateįlat rate packaging is offered by most carriers. NoteĮnvelopes are not supported with Canada Post through Shopify. EnvelopeĪ large, flat envelope no thicker than 3/4 inches. Packages thicker than 3/4 inches don't qualify for USPS First Class Mail rates. Soft packĪ padded envelope, bubble mailer, or plastic (Tyvek or Poly) sleeve. To learn more about maximum package requirements for specific carriers, refer to Shopify Shipping carriers. Length is measured on the longest side of the package.

Girth is the measurement around the middle of the package, and is calculated as 2x width + 2x height.

Package shipment limits are set by the carrier. You can use the following package types to ship your products with Shopify Shipping labels.

Flat rate envelope dimensions