These daisy chain straps are long and strong, and have the advantage of being able to quickly adjust a swing or hammock, by latching the carabiners onto a different loop of the strap.
You can hang with 1 strap and have a swing swivel, or you can use 2 straps to decrease spinning, or for a hammock to hang horizontally.
They're easy to set up and strong too, so your kids can be swinging within minutes. You simply pass the strap over a strong branch or beam, loop the strap through itself, then attach the carabiner at the desired height. Just have an adult test the set-up before use.