@joleneandjack wrote: .. USPS changed things, how does everyone ship sewing patterns? I'm pretty new to selling and new to selling patterns ... When putting in shipping for a listing for patterns, First Class Large Envelope comes up as an option so I'm ASSUMING it's ok ...
That's not a reason to assume that it's OK. The USPS has very strict criteria for a piece to be eligible to be mailed as a Large Envelope (which they call a "flat"). It must be flexible, of even thickness (which USPS defines as a variation in thickness of not more than 1/4 inch), and no more than 3/4 inch thick. Most single commercial patterns and many clothing items would be eligible.
The recent changes which merged the service formerly known as "First Class package" into the service that's known as Ground Advantage had no effect on eligibility criteria for First Class letters and flats. You can see all the technical details (dimensions, etc.) here:
https://pe.usps.com/text/dmm300/101.htm#ep1002686
First Class letter and flat services do not include tracking, so sellers who use those services frequently would find themselves ineligible for TRS status, which requires timely tracking for at least 95% of your items. Lack of tracking also leaves a seller vulnerable to fake "Item not received" claims, but I suspect that sewing patterns are not a high-scam category.
