As a kid, I can remember my father doing work for two gentlemen who had numbers tattooed on their hands. When I asked my father about the tattoos it became quite a solemn moment, as my father had to explain to his young son the horrors of WWII and the holocaust.
The reason I bring this up, is that I can remember him telling me, before the war, those two gentlemen hid their diamonds and gold in the ground. When they were finally free of the camps, they were able to return and retrieve it. That small bag of diamonds and gold is what they used to travel to America and start their company.
It might not be what one traditionally thinks of as a 'go-bag', but it worked out for them and that's really what matters in the end.