USPS Mail Flat Rate Envelopes are a shallow 9" x 12" cardboard envelope and may hold 1 or more items up to 4 pounds. Some items may not fit, and have to be shipped in a flat rate box. United States Envelope APO/FPO $5.45
Flat Rate Boxes for multiple items are 12" x 12" x 5-1/2" and hold up to 20 pounds. US $13.60
We Combine Shipping. We use calculated shipping which takes in account weight and volume to properly combine your shipping charges. For larger, bulky orders, or combined orders the shipping calculator will automatically upgrade shipping to USPS Flat rate boxes. Please email us at firstname.lastname@example.org with any shipping, and packing questions, or if you are looking for something not currently in our listings, we will gladly check availability.