Zackary was unsure at first, but soon he was traveling back and forth through the opening as well :)
Sadly, the only member of our family that couldn't fit through the hole was Ty. If we are ever in an Indiana Jone's type of situation we will just have to leave him behind.
(Never mind that all of the boxes are sporting beer and cigarette labels. Our kind Indian neighbor owns several gas stations and has been bringing us boxes from work! I think we probably have enough.)