Randall Munroe has covered a very similar topic.
https://what-if.xkcd.com/108/
The shoebox idea could extend to a small carry on bag. See if they'll
let you carry a few kilos of Plutonium.
On 12/24/2015 11:04 AM, Chuck McCown wrote:
So, with a $20K limit on moving money when flying I got to wondering
if it would be better to carry gold.
Nope. $100 bills much better.
http://www.evilmadscientist.com/2008/the-monetary-density-of-things/
So, it will be a bag of diamonds when I flee to a non extradition
country...