Hi,
I have been sewing for over 60 years, since I was a little girl, and have built up a large stash of patterns. Recently I decided to sew most of them and opened a store on Etsy last month. Some of the patterns are uncut, but most have been used. The majority of my patterns are from the 80s and 90s.
I have sold several, and mail them in white bubble mailing envelopes. I make items and sell them, so had purchased the envelopes in bulk from a company called ULine. You can find them on the internet. The bubble mailers come in a large variety of sizes, and are so easy to use (waterproof and don't bend easily). The bubble mailers are pricey in the stores, but very affordable when bought in bulk. I feel safe when shipping things overseas in them as they re so sturdy. Plus it is really convenient to have them on hand.
Hope this helps. Janie