Stacking two pets vertically is what separates this blue stroller from a side-by-side model: each deck is its own fabric cage, so a nervous cat and a boisterous puppy do not have to negotiate. Both cages detach and travel as carriage bags for a car or subway trip, measuring 13 by 14 by 22.5 inches and rated to 17 lbs each. The bare frame folds in about three seconds by pulling the arrow and pressing the armrest, collapsing to 20 by 11 by 33.5 inches. Thickened EVA wheels absorb shock, with 360-degree swivel at the front and brakes at the rear. Carpeted floors with movable mattresses line both bags. Standing 41.5 inches tall on a 20 by 27 inch base, the steel and oxford build weighs 17.5 lbs.