We have been using 3M Scotch Bubble Mailers envelopes to mail photographs, CD's, and books. These envelopes serve the purpose just great! They are durable, cushioned with bubbly plastic inside to protect the items you are mailing, with a pre-printed warning "Handle With Care, " and a convenient self-sealing closure. Several sizes are available, we used Size 5 which is 10.5 X 15 inches. Color is standard yellow, no variety available, but I don't think it's that big of a deal.
The envelopes are sold in different quantities, we bought a box of 25 to make sure it will last us a long time, and it did. All the items we've mailed in these envelopes have safely made it to their destination, so the envelopes do provide good protection. I highly recommend them.