Using Priority Mail Tyvek Envelope

[asylannaailuj]

What category does a Priority Mail Tyvek Envelope fall under when I'm printing a shipping label? I sold some gDiapers and I was hoping to be able to ship without using Priority Mail but that's all that is coming up when I try to print a shipping label.So, when I'm using Tyvek Envelope, which option do I choose?

My options are: (all Priority Mail)

-Flat Rate envelope

-Small Flat Rate Box

-Medium Flat Rate Box

-Large Flat Rate Box

-Padded Flat Rate Envelope

-Legal Flat Rate Envelope

-Regional Box A

-Regional Box B

-Package/Thick Envelope

-Large Package

-Package/Thick Envelope

I'm still new to the whole ebay selling thing so I need some help - thanks in advance. 🙂