I never really thought about how the indigenous Australians opened their mail, but the answer is right here. Just slip one end of this boomerang into the letter and tear it across the top. Very simple and stylish.
It can also be very useful for rodents. If you see one of those varmints poke their head where it doesn’t belong, you can just take aim at him with the boomerang. If you miss then it should come right back to you.
