For sale is Whoopieslings "All in One" Suspension System.
Here's a link to the item
These are very nice and well made. I've use them only once but found I prefer cinch buckles. The All in One System sometimes requires you to make several wraps around smaller trees and there was a little more fiddle factor than I care for. Otherwise, they are great for those who love whoopie slings and want everything in one package.
$35 Shipped in Cont. US/Paypal