I am so happy with my new Baby Delight - Go With Me Span Expandable Folding Gate.  The gate folds down to a minimal size and comes with a carry case.  This was perfect for us to take to grandmas house to keep the kids out of her treasured room.  The gate is very easy and quick to set up and does not leave any marks on the walls.  I love that you do not need any hardware.  The gate is made of excellent quality and does not fall down when my 14 month old is pushing on it.  This is also great as a pet gate too.