Maximum Dimension and Weight for Flat Rate Boxes and Envelopes
The USPS Flat Rate service is a great option, if you do not want to worry about providing the weight of your packages to calculate shipping costs. You can use this option as long your package is under 70lbs (for domestic shipping) and 4 up to lbs (for international).
Flat Rates come with several different types of packaging and each is priced differently. The chart below details the Flat Rate boxes and envelopes:
If you want to ship using a Flat Rate Box or Envelope, you must use branded USPS boxes. You can easily order them online or pick them up at your local Post Office.
Keep in mind that when sealing a Flat Rate Box or Envelope, the container flaps must be able to close within the normal folds.
For any questions or additional assistance please contact us via email, support@myibservices.com.