"Personally, I dislike much bulk where the hidden pocket is designed to ride..."
haha, some of us don't have the luxury of a choice.

i made use of something like this overseas. i think it was intended for carry around the neck, but i hated the "flapping" and it was SOOO obvious. so, i ended up tossing it down the shorts, figuring that if someone wanted it that bad, well they'd have to earn it.
i ALWAYS had a mini-SAK, lighter/matches, passport (and copies), travelers checks, credit card, check card and 2 forms of ID in mine at all times. when i went to bed, normally in a hostel environment, i would stuff it down my shorts.