Money laundering is the process of making illegally-gained proceeds (i.e. dirty money) appear legal (i.e. clean). Typically, it involves three steps: placement, layering, and integration. First, the illegitimate funds are furtively introduced into the legitimate financial system.
Here is information about a currency bill, According to the Bureau of Engraving: * Our present sized currency measures 2.61 inches wide by 6.14 inches long, and the thickness is .0043 inches. * The approximate weight of a currency note, regardless of denomination is (1) one gram. $1,000,000 is 10,000 $100 bills, which weighs 10 kg or about 22 pounds. If stacked in one stack, the height would be 43 inches high or about three and one half feet. Easy to carry in a briefcase if that is what you had in mind.
If you want to get one million dollars cash into a small package, your best bet is by stacking 10,000 of the $100 bills. Like most bills, $100s come from the bank wrapped in bundles of 100 bills ($10,000 bundles).