How much does $1 million weigh? That depends 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.
That is, there are 3/4's of a pound of cotton in each pound of dollar bills. This same source also says that are 454 bills in a pound of currency.
So when you watch TV or a movie and there is a payoff in a suitcase or a duffle/gym bag....will it fit, how heavy is it as they are swinging along with it?