This is the $40 'EASYANT Mini Outdoor Every Day Carry Coin Purse Bag Men Utility Self-Defense Multi-Tool' available on Amazon. I'm pretty sure 'multi-tool' in this case is just two though: coin purse and skull thumper. The leather purse was designed to be fastened around a belt with its single snap so it's available for quick release and beat-down should the need arise. Just make sure you don't spend all your change on chewing tobacco or the thumper won't be as effective. Man, I still remember the first time I got hit with a sock full of change. "What were you doing?" Trying to steal my brother's sock full of change. "So you deserved it." I didn't say I didn't deserve it, I just said I remember it. *fills two crew socks with loose change, ties them together like nunchucks* Wanna play nickel ninjas?
Keep going for a couple more shots including one of the thumper being worn on what is quite possibly the cheapest belt I've ever seen.
Thanks to Shawn OB, who agrees you'd be surprised the amount of damage some concentrated coinage can do.