GraphicRiver - Reflx Poster/Flyer Template
The PSD file is very well organized, with color coded groups and layers named appropriately.
PSD | 2625px x 3375px (8.5x11" with .25" bleeds) | CMYK | 300 DPI | 602.5 Mb

Info:
http://graphicriver.net/item/reflx-posterflyer-template/154204