Blackjacks are those concealable club things that mafiosos use to knock out unwitting victims.
They look a bit like this:
Unless of course, you’ve forked out for one of these cap-jacks – or blackjack-caps – or Sap Caps – because in America they’re called Saps. It’s cunningly disguised as a black cap.
Here’s the product description – for your edification.
This standard baseball cap can be used as a blackjack or sap. Just use the bill as the handle and the cap as an impact weapon. The secret of the Sap Cap is the pocket of a unique impact material that is 110% the density of lead and will not rust. Velcro adjustment.
I’m so glad they included the bit at the end about the velcro adjustment – because that’s what I’d been worried about. I’m sure it’s also good for keeping the sun off.
It’ll no doubt go nicely with your sword umbrella.