Put this out in the hall at my son's first bday, and all the kids LOVED it, walkers and crawlers alike.  It folds down easily enough to take it to a friend's house, and even more sensitive kids aren't afraid to get inside since it's transparent.  Even my 15 year old cat likes to play in it.  The velcro  for the storage straps can get caught on the walls of the tunnel if it is latched carefully, but so far no holes.