10 envelope, 100x190mm or abour 4.0x7.5 inches. Designed for a B5 sheet folded in thirds. To seal, there is a pull strip with a good adhesive.
This is the matching envelope for the LIFE Airmail paper L1096. If you don't need the pad you can buy the just the envelopes. They are lighter than regular envelopes and have no inner lining. These will really jazz up your correspondence, and anyone who receives one of these will certainly do a double-take. Check out the cool inside print!
In some ways, I am sad that the airmail age is over, but then again, it brings new meaning to this vintage-y stuff. Each week I go to the Irvine flea market to look for this kind of ephemera, and the airmail letters definitely catch my eye.