CAN004 is a front view shot of a 355mL soda can.  The PSD Mockup renders your 2D dwesign onto a standard soda pop can product shot, the dimensions are similar to those used by many soda producers and unfortunately may not be set dynamically prior to rendering. The final render is presented to the designer in a newly generated Photoshop document with multiple layers which can be futher manipulated by the designer to customize their designs further.  The background is fully transparent allowing for any number of backgrounds to be added at any time.