This is the first prototype that I created, it is the most basic of the three but also the most suitable. It folds up easily into itself so that one piece of paper can be used for the envelope and the poster.
I then moved on to this design it is quite similar to the first except from the tab, which is a good addition but I don't like how it makes a slit in the surface which will transfer to the poster.
This is my final prototype it is different to the others with the additional sides. Even though it creates additional surface area, I don't think the additional panels work well for the aesthetic.