I need help selling on ebay?

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Im going to sell an item on ebay in a larage priority mail box, that i got from USPS. How do i calculate how much shippping is goig to be when i price it on ebay and on the top right of the priority mail box it says "Priority mail postage required" in a small box, what does that mean? The label that i print from ebay or is it something else?

[♥♫i♥bloo♫]

Postage for a Priority mail large flat rate box costs $16.85. It is a fixed price, no matter the weight. When you list on ebay, under the shipping cost, enter exactly $16.85. You can print the shipping label directly from ebay. When you go purchase and print the label just make sure to choose priority mail large flat rate box. And yes, this label you print from ebay is priority mail postage.