I used these envelopes for invitations for a baby shower and they worked great. I printed on that and wrote in pen and didn't have any bleeding of either ink. Very crisp and clean great envelopes.
As a card maker I am always looking for well-made envelopes in the sizes I use which are not the usual #10 envelope. I'm happy that Staples has both white and ivory cards in two sizes that I use the most.
These envelopes are a little bigger than 4x6 photos so the photos slip in nicely. They're thick enough that I couldn't see the photo invitations I put in them. Staples had the best price I could find!