yes as Steve said the overlays come rolled, all in one piece, which is awesome. Also, there is no backing for your frame, the backing is actually the wall on which you are mounting the poster. Rob usually throws in an extra overlay, so you can use that on the back of the poster so your poster isnt directly on the wall/paint. This makes everything nice and snug so there should be no sagging (f-u gravity)
If over time you see any sagging, which MAY be something that could happen given the weight of a linenbacked 3 sheet, all you need to do is put a couple pf pieces of cardboard (or better yet, acid free coroplast) to add some pressure to the system and make everything ever more snug.
Robert please be aware that I will reference this post the next time I make a purchase ifyouknowhatimsayin
