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What is a Whoopie Sling?
Explanation from Wikipedia
The whoopie sling works by wrapping the sling around a heavy load bearing limb and pulling the end of the rope within the sling through a spliced choker. By adjusting the size of the eye in the rope through the choker the user is able to adjust the length of the sling constricting around the tree without needing knots. It is also becoming more common (usually in smaller diameter) for suspending hammocks during hiking, camping, or sailing.