This exercise pen worked out great!  We purchased two for our pet rabbit so she could exercise outside and still be safe.  This one is high enough so she can't jump out and the entrance door is several inches off the ground so she can't scoot out when we enter or exit.  The reason we got two is so we could make the space larger.  This was an easy modification because the pens come with claw hooks so we were able to attach one pen to the other.  After seeing how well this worked out for her, we are considering purchasing several more to make an enclosure around our potted vegetable garden.  It seems like the perfect solution to keep our plants safe from unwanted visitors!