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What are the box sizes at USPS?

Generally, using your own shipping box can be cheaper than a priority shipping box provided by a carrier, especially if you can use a box that you already have or one that is more appropriately sized for your shipment. However, the cost will depend on various factors, including:

Is it cheaper to use your own box or a priority mail box?

Popular USPS Ground Advantage boxes for relatively small items have 4x4x4 and 12x12x12 sizes. Ensure the box is in good condition and free from old markings or previous shipping labels. We also recommend going green with the packaging if you can.

Is it cheaper to use your own envelope for priority mail?

No. The charge for Priority Flat Rate includes the cost of their flat rate boxes or envelopes, which have to be used for the package to be charged at that rate. You can use your own supplies for regular Priority, though.

Is it cheaper to ship something in your own box?

The Advantages of Using Your Own Shipping Boxes Custom shipping boxes offer flexibility and can often be a more economical choice, especially when shipping lightweight or non-standard items.