[Peter_Spaeth]

Originally Posted by ocjack

I used to buy mylar sleeves from a company called Stampmount. I found the mylar was far superior to the plastic penny sleeves.

https://www.washpress.com/stampmount.jsp

Yeah, if you're trying to preserve the Declaration of Independence.

Personally I think one doesn't have to go that far, and mylar sleeves in my experience are hard to use with toploaders.