Sack Sling by OxBalls
Lube it up inside and out and put your penis through the front hole, drop your balls inside the sack. There is a built-in ball ring that helps keep your balls in the sack. The enlarged ball sack collects your ball sweat and drains it from the two nut shaped holes down at the bottom. Even if you have high and tight nuts or a short sack, this thing will grip your balls.