Santa's sleigh, I think, is certified for the vacuum of space.

NASA 's Kenny Todd hinting at some of the contents of the 3-ton payload aboard SpaceX’s 19th supply run to the International Space Station, which launched on Thursday. The shipment also includes a robot sensitive to astronauts' emotions, a miniature version of a brewery's malt house and "mighty mice" for a muscle study. In fact, 40 mice are aboard, all adolescent females with black fur. Eight are "mighty mice," with twice the muscle mass of ordinary mice. (Chicago Tribune – December 05, 2019)