I recently attended Dallas comicon and wanted to make my own costume... This was what I was going to be originally but later decided to go as wolverine so I figured I'd make an instructable.
Step 1: Template
These are the parts you will need to cut out of your milk jug.
Step 2: Glueing
Glue the pieces together like shown with a hot glue gun making sure the seams are smooth.
Step 3: Painting
Next glue the caps on the front for more detail and then gather white spray paint and a black sharpie. Paint yours like my picture or make your own!
Step 4: Finished
Now cut eye holes and put a duct tape strap in the back to hold the mask in place. I also found that you might not need a strap because some times it holds itself in place.