Look for the pic of the briefs about half way down:

http://www.efindoutthetruth.com/Diversion_Safes.htm

The "Underwear / Brief Safe" is an innovative diversion safe that can secure your cash, documents, and other small valuables from inquisitive eyes and thieving hands, both at home and when you're traveling. Items can be hidden right under their noses with these specially-designed briefs which contain a fly-accessed 4" x 10" secret compartment with Velcro closure and "special markings" on the lower rear portion. Leave the "Underwear / Brief Safe" in plain view in your laundry basket or washing machine at home, or in your suitcase in a hotel room - even the most hardened burglar or most curious snoop will "skid" to a screeching halt as soon as they see them. (Wouldn't you?) Made in USA. One size. Color: white (and brown).

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280