The Eagle Creek Hidden Pocket: http://shop.eaglecreek.com/undercover-hidden-pocket/d/1130_c_312
Use the Undercover™ Hidden Pocket travel accessory to keep important travel documents and personal identification items out of sight. This simple hide-away pouch slips onto your belt and conveniently tucks into the waistband of your pants. Made of a durable, yet discreet, lightweight nylon ripstop, this under-clothing solution has two mesh pockets for organization of a Passport and currency. Great for international travel, it’s even got a moisture-wicking and breathable back panel to help you stay comfortable.
For more information on the Undercover™ Hidden Pocket visit http://shop.eaglecreek.com/undercover-hidden-pocket/d/1130_c_312