Santa's bag of presents has been confirmed by NORAD that it is in fact special. The bag was made by 18 elves. It took about 3 months and he did it before he first came out. The elves made it so it was the most lightest but sturdy. It holds about 60 billion presents or more. They made it so it feels light even though it has that much presents. It never gets full, it's so special you can put billions of presents in it and and it won't be full or break or feel heavy. The fabric is so dense that there is no history of any presents being damaged by turbulence or broken etc.