Now see ... LOL ... I really thought he was packed in overflowing a bit with him and his bag.... I guess it just depends on your imagination :) Seriously this was how I’ve always envisioned it....
And I’ve always struggled with “miniature” part versus the image of Santa as a rather hefty fellow.
By the way, there’s also a reference to “the prancing and pawing of each little hoof” after the “coursers” surmount the rooftop.