We have four ferrets and needed a portable medium to larger sized travel cage for our vacations. Even though this cage states it is for cats and dogs, I found this was large enough for all of my ferrets so they could have their privacy in different areas of the cage.
There is room for a small dish of food and water and two medium to small litter boxes. You’re not supposed to keep all those things so close together, but our vet said it would be fine for the short period of time of overnights for a few days.
The travel cage is secure enough for our ferrets so we and has good ventilation without the bulk of a wire cage. Pet Gear Travel Lite Octagon Pet Pen with Removable Top for Cat and Dog up to 30-Pound, 29-Inch, Sahara