A Pillow Case - fill one with door knobs and you've got a weapon that can be

fill one with door knobs and you've got a weapon that can beat up a cop

I filled my pillow case with keys and beat up my brother like a cop.

She used a pillow case full of padlocks to smash her ex’s face.

That guy took a pillow case full of hinges and knocked out three guys at a bar.