bum bag

vyölaukku puhekieltä A small pouch attached to a belt that is worn on the outside of clothing around the waist and used for holding small personal items.
1995, Vitali Vitaliev, Little is the Light: Nostalgic Travels in the Mini-States of Europe, http://books.google.com.au/books?id=VzIdiHDtByUC&q=%22bum+bag%22 %22bum+bags%22+-intitle:%22bum|bums%22+-inauthor:%22%22&dq=%22bum+bag%22|%22bum+bags%22+-intitle:%22bum|bums%22+-inauthor:%22%22&hl=en&sa=X&ei=f-ETT8HkL46NmQWY2rjfAw&redir_esc=y page 226,

There is no queue at Burger King in Gibraltar. To lure customers, they give you a free plastic bum bag with every Whopper Meal.

Don′t confuse money belts with bum bags. A bum bag is a larger and an altogether more ostentatious item; it′s worn over your clothes and can usually hold a small camera as well as sunscreen and sunglasses. As a security item the bum bag is useless and may as well be inscribed with flashing lights announcing “Valuable items inside, help yourself”.

Berichon: I proceeded to pull the pistol out of the bum bag. I flicked the safety switch off the pistol and I fired upon the police officer.