The new box has inner dimensions of 12 inches x 12 inches x 5-1/2 inches and has 50 percent more capacity than the current flat-rate box offering. What are the dimensions of the new Priority Mail Large Flat-Rate Box?Ī. The new box will allow shippers of smaller items to consolidate shipments on multiple orders to save money and build customer loyalty. Why do we need a larger Priority Mail Flat-Rate Box?Ī. Make sure your box does not have anything loose hanging from it like twine, string, or tape because it can get caught in the sorting equipment.Frequently Asked Questions Priority Mail Large Flat-Rate Box.If your box has other stickers or logos other than the USPS logo for Priority Mail boxes, cross them out with a marker or cover them with your postage label.

Use a box that will hold your shipment but still leaves a little bit of room for you to add any padding material.

You don’t have to use the USPS Priority Mail box.

For Retail Ground and First Class Mail, you can use any sturdy cardboard box.Do not use cord, string, twine, masking tape, duct tape, or cellophane tape to seal your box.Reinforce the flaps on the top and bottom with tape so that the box doesn’t open while in transit.

Seal the envelope or tape the box shut with clear or brown packaging tape so that it closes flat on all sides. Fit your item(s) into a box or envelope and add cushioning materials like bubble wrap, newspaper, or packing peanuts if necessary. Pack your shipment into a box or envelope and seal it shut. This article has been viewed 1,882,506 times. This article received 15 testimonials and 100% of readers who voted found it helpful, earning it our reader-approved status. WikiHow marks an article as reader-approved once it receives enough positive feedback. There are 10 references cited in this article, which can be found at the bottom of the page. She enjoys the process of researching and learning new things to share with readers and creating content that is both informative and fun. Ali now writes as an editor at wikiHow with the hopes of becoming a part in helping to achieve wikiHow’s goal of teaching everyone to do anything. She has published articles centering around culture and history for non-profits and has also done news writing for an online news site. in Linguistics and Asian Languages and Cultures with a focus on East Asia from the University of Wisconsin-Madison in 2022. This article was co-authored by wikiHow staff writer, Ali Garbacz, B.A.

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