I was unhappy with how flimsy and see-through these #9 envelopes are. The whole point of including this size envelope in another mailing is to make it easy for people to send back PAYMENTS and with these #9's I can actually read the checks through the thin paper! Yikes! I looked for security #9's but the only ones I could find also had windows. I needed solid ones and didn't have enough time to track down another option. I was nervous about using these and some of our donors used their own envelopes instead.
These are a perfect size for inserting into a Number 10 Envelop for a Return Envelop. Of course these could still be used for a Regular Mailing...using Folded 8 1/2 x 11 Stationary.