Dave Madsen wrote an answer about The North Face Kaiju 6 Tent: 6-Person 3-Season on June 3, 2014
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The North Face Sales Representative- Utah
Yes the small vestibule on the back is accessible from the outside with a vertical zipper.
Spent a week camping in Big Sur, CA. The Kaiju 6 worked great and had plenty of room for Me, my wife and 2 year old.