Sadly, this big envelope doesn't contain a sleek macbook air but it can at least help you present your new design. This envelope mockup makes use of the world famous smart object layers to make it easy for you to paste your own logo/design on it.

The envelope and the shadow are on separate layers and can be moved around. The background is also on a different layer so you can easily change its color or replace it with a texture. The file comes in PSD format and features a high resolution of 3000x2250.

The layers have custom names so working with this file should be a piece of cake! The logo in the preview is also included!