Slow Loris wrote:Andrew_s – which hammock/tarp is this? How comfortable did you find it in comparison to a tent, and how easy/fiddly would it be to set up? Always fancied trying one but I'll need to brush up on knots - my last attempt slid to the floor

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It's an Exped Ergo hammock & tarp (i.e the "Combi").
No knots are required.
Wrap the tree ropes round the tree, passing one end through the loop in the other, then clip the hammock suspension line to the tree rope with a carabiner. The tree ropes are semi-double, with a slit for a carabiner or toggle every 8 to 10cm.
The tarp has toggles that go in the tree rope between the carabiner and the tree, and 6 lines attached to the corners with a clip to clip round another tree, branch bush or tent peg, with a line-lock at the tarp to take in tension.
The hammock has a double base for holding a sleeping mat (required for insulation rather than comfort), and a zip round upper midge net.
You sleep on a diagonal to the ridge line, and can lie flat or on your side). I'm 1m85, and it's only just long enough. I find it more comfortable than the same mat (Neoair Xtherm) in a tent, which is probably good as it's not so easy to change position. On the downside, a tarp doesn't warm up inside like a tent will, so more clothing and/or a warmer bag may be required.
Ideally you would hang it so the bottom of the hammock is about 40-60 cm from the ground. The two carabiners should be level with each other, or you'll tend to roll to the side, and it seems to work best it the trees are a bit over 3m apart, though it can be rigged between about 2m and 6 or 7m.
There are videos on putting it up available here:
http://www.exped.com/usa/en/product-cat ... mock-combi