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Noun: butt pack
Usage: N. Amer, informal (elsewhere: bumbag)
  1. 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