Thought I'd mention this method of hammock suspension I call a "line locker". I saw this method being use by "slackliners". It uses a rappel ring and carabiner. It locks both the working and tag ends of the climbing tape shown in the picture. It's not the lightest way to go but it gives you a carabiner on each end of your hammock suspension to attach stuff to. In the photo I'm using 1" climbing spec webbing, an Omega Pacific rappel ring, a Black Diamond carabiner, and then you see a whoopie sling going to my hammock.