Advice needed. What's the safest and most comfortable way to carry about $40,000 in 100s (400 bills) on your person? That's about a 4 inch stack. This would be for 8 or more hours. Important considerations would be keeping the money safe in the case of mugging, not accidentally losing it, and keeping reasonably comfortable.
Taking an international flight? Take your money to a duty-free store that has locations in both countries, buy a bunch of expensive shit (furs, watches, jewelry, etc...), and then return it all for a full refund once you get to your destination.