couldn't fight your way out of a paper bag

couldn't fight (one's) way out of a paper bag

Is extremely weak, ineffectual, or incompetent. You can definitely beat that scrawny kid—come on, he couldn't fight his way out of a paper bag!
See also: bag, fight, of, out, paper, way
Farlex Dictionary of Idioms.

couldn't fight your way out of a paper bag

If someone couldn't fight their way out of a paper bag, they are very bad at fighting. They are no use to you as allies. They couldn't fight their way out of a paper bag. Note: You can replace fight with other verbs that state what someone is not able to do. Not one of these actors could act their way out of a paper bag.
See also: bag, fight, of, out, paper, way
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • couldn't fight (one's) way out of a paper bag
  • couldn't fight (one's) way out of a wet paper bag
  • couldn't punch (one's) way out of a paper bag
  • he, she, etc. couldn't punch his, her, etc. way out of a paper bag
  • can't punch (one's) way out of a paper bag
  • can't punch one's way out of a paper bag
  • can't punch (one's) way out of a wet paper bag
  • empty suit
  • weak sister
  • meat on (one's) bones