Bought this for my 5 lb. Holland Lop Rabbit and so far everything is working out well with him in it. Built very well and perfect for a rabbit his size. I got the tallest one you could get since he is a jumper. I would recommend it to anyone who needs a pen for their rabbit or small animal and wants to give them more a free, and exercise filled day. Side note: No carrying case, which would be nice for how big and heavy it is, however the weight isn't too bad, and comes with clips and accessories to keep the pen stable. Overall a bit more then I would like to spend, but still the cheapest option I saw for the height, size, etc. Buy this!