Below is my adapted dl envelope which I have customised with the addition of an extra panel and rounded opening flap. I have then added the stamp dimensions, colour and posting address as a mock up to see what my final envelop will look like. It works so well together and is easy to see how my envelop ties in to my set of posters I created. The final flaps won't be grey but I have just left them like that so I can distinguish between the flaps and main panels of the envelope.
