A million dollars in $20 bills
would weigh 110.2 pounds and occupy 2 cubic feet. That isn't a trivial amount of weight/bulk to slog a substantial distance through uncleared forest as a pack in general. It's possibly
doable (see here
, para starting with "In February 1974...
"), but to do it through mountainous terrain
adds an even greater challenge to the mix.... The show doesn't really ever consider this aspect of their scenario.