canvas Bag
Three tins of beans
or Cans of pop
Knife Attack
Attacker Apporoaching throw a can at his head
Then use the bag by the Straps a figure of eight motion it keeps him six feet away from you !
May you catch his knife and disarm or crack him on the head !
Some point he will pause 2nd can close proximity to his head if you miss you still have your six feet perimeter

Every Woman in the UK as ex Forces this is my best solution in the UK

Umbrella or Walking Stick

Be Armed somehow = Spray perfume in their eyes