Fanny-pack definitions

A waist pack, especially as worn with the pouch over the buttocks.
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A small, usually zippered purse or pouch worn at the waist, for carrying keys, a wallet, etc.
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(North America) A small fabric pouch secured with a zipper and worn at the waist by a strap around the hips.

She wears her fanny pack every day on her morning jog around Central Park.

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