How much does $1 million weigh? That would depend on the denomination of the bills you use. Since there are 490 notes in a pound, if you used $1 bills it would weigh 2,040.8 pounds, but if you used $100 bills it would weigh only 20.4 pounds.
http://www.factmonster.com/ipka/A0774850.html
Those $100s would be light as air, don’t you think?