fanny pack 
noun
North American term for bumbag.McAlhany described Alpizar as carrying a big backpack and wearing a fanny pack in front....
- This is the kind of gun that can be tucked in the pocket of shorts, a purse, a fanny pack, an ankle holster or even a day planner.
- Even when fully loaded, it remains light enough to carry in a jacket pocket or a small fanny pack.