Hello, I dont know why I never made one before but after a few throws with my first today I know there is going to be one in every rucksack and vehicle I own!
I made the split rectangular leather cup design with paracord leads for simplicity. Going to make a couple more tonight and pass em out in the morning at the archery range, woohoo!
I have a hard hat, kevlar helmet and a 12 gauge steel helmet with 1/4 inch rod face shield. I think I will take them all cause three noob slingers will surely post a few peaks on the pucker scale!

Spent a couple hours slinging at the creek this morning after workday at the range. I took three but only two of us were slinging and my slings worked great, nothing came loose or tore, it was a blast!
We shifted a significant amount of weight from the sandbar to farther down the creek.
Thanks to the info I got here I was able to make good functioning slings the first time. I dont even have to make any adjustments or repairs, works great.