I was at the bank today and measured 100k in "used" hundred dollar bills. (I know the tellers very, very well and they are accustom to me and some of my odd requests
, so they let me measure a stack of 1000 used hundred dollar bills. Since they were all used, they didn't sit as flat as a stack of all new bills. Interesting, I noticed there were still a few of the older 100 bills in the super stack. (They didn't have stacks of new $100 bills to compare.) Away it was exactly 7 inches high. Not really very impressive.
If they would have had a million in $100 bills for me to measure (they didn't) it should have been 70 inches tall, assuming no compression due to weight. That's less than 6 foot tall. Or a short stack as we say in Texas
Here is an old thread from this site that talked about how to comprehend how much a million is.
Ways to comprehend how much a million is