I've just made a sling out of 1.1 mm Kevlar cordage, I've used twelve strands arranged in a three strand plait. The retention loop is a five strand plait. The whole thing is made of continuous strands with no splicing. Each 1.1 mm strand is rated to hold 250 lbs X 12 = a total strength of 3000 lbs (1360.77 kg) for the entire sling. I'm interested to see if this sling is can actually stop a bullet, so I plan to shoot a length of Kevlar rope I made that is identical to the sling with a .22 LR from a long barreled rifle, and if it holds up to that a 9mm pistol. Because the Kevlar is not arranged into multiple sheets making up a panel I doubt it will actually hold up to a bullet, but who knows, anything could happen. The first rifle I plan to shoot it with first can barely put a dent in a cheap spoon. A sling can turn that same spoon into scrap metal, so maybe I will throw some glandes at it. I don't think the sling would do more than the guns to Kevlar because it is more blunt force, and doesn't have the penetrative power of a bullet.
I plan to upload some pictures of the sling and the damage tests soon.
Anyway, Kevlar seems to be a great material to make slings out of, it is enormously strong, long lasting, abrasion resistant, doesn't stretch when braided correctly (a five strand braid made from Kevlar has some springiness to it), is dirt cheap, and looks nice.

and, you could use it to tow your car or boat if necessary

You beat me to it!  I was about to make a sling out of Kevlar, have the stuff, just couldn't get myself to get it started. I wasn't going to shoot it though. So this will be very interesting.

Here is a picture of the sling. The bullet damage test will take a few weeks.

Nice job!

Wow! Looks bomb-proof.

The test results are in, and from both a .22 LR and a .22 hollow point the sling is... completely undamaged! There is no sign that the Kevlar was even shot except for a small amount of lead rubbed off the bullet and left on the cordage. Next test, 9mm pistol rounds.