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.

Priority mail flat rate envelope size