Hummingbird Hammocks have one of the lightest suspension systems around (2.3 oz – 66 grams per hammock). The genius idea about them is the whoopie sling tension adjustment system. Here’s a little video I took showing how they work. Setting up your hammock just perfectly is literally a breeze and the work of a minute.
Here is another video which might explain it better: https://www.youtube.com/watch?v=FN8VlDofU8o
It is a little hard to see how they work, but basically the end of the rope is passed up through the hollow centre of itself, forming a loop at one end) so that it can slide fairly freely through when there is no tension but as the tension increases the outside of the rope (tube) holds on harder and harder to the length that is passing through it. It is an ingenious idea (probably familiar to riggers), and would also work well for tent guys. In the pictured example there is a handy knot at one end to hold on to whilst pulling the end through and so tightening up the ‘hang’ of the hammock. These would work with any kind of hammock, and can be bought separately from them (see below)
Tier gear also a make an adjustable centre line (using the whoopie sling principle) which helps your hammock to hang flat. They certainly do that, and only add 6 grams to the weight of your set up Well worth it as it also gives you somewhere to hang a few things. You can make a small silnylon bag (like a miniature saddle bag) to hang from the centre line so that you can easily reach things like your glasses or head torch in the middle of the night.
I usually add a gear hook at each end of my hammock(s) so I can attach things out of the weather at the ends of my hammock.This only adds a couple of grams too.