Noun: butt packUsage: N. Amer, informal (elsewhere: bumbag)- A waist pack worn with the pouch in back
"Tourists often wear butt packs to keep their valuables close";
- fanny pack [N. Amer, informal], bumbag [Brit, informal]
Derived forms: butt packs
Type of: belt bag, waist pack
Encyclopedia: Butt pack