My Porty has not been removed from the 5/8" x 25' Tenex eye sling for years. It's a bit of pain on small trees, but not a real big deal. I find it less of a hassle than having to keep track of multiple slings. But the length of the sling you need is in part determined by the type of knot you tie it into. For example, I like to use a timber hitch to attach my Porty, which requires 1.75 - 2 circumferences of the tree. So on a 3 ft trunk, I need a 18 ft sling to tie that knot. A cow hitch on the other hand requires about 3 circumferences. But if I tied a simple bowline instead, I'd only need 1.25 - 1.5 circumferences. I just don't like to use a bowline here though because I heard it creates a bigger strength reduction than a timber hitch.
