I use a verticle top loading leather case by RexRegina. The model name is: Morgan. It's made from thin high quality leather. Designed specifically for each BB model, it's a precision close fitting case without a belt clip. Therefore I carry it I'm my front pants pocket very comfortably.
I frequently travel to New York, London, & other major metro cities were pick pockets are frequently encountered. Being prepared is the key. I have yet to have my BlackBerry stolen. Along with my laptop, these two devices keep me connected & in business. Therefore I take every possible precaution to keep them safe.
My All Time Favorite: _RED-8310_ Backups: 7130c, 8100, O2 8300, at&t 8300, 8700c, 8800, 8820