New answers tagged ultralight
You could also have a look at the "Reflect Wedge" setup for the ALPKIT.COM Rig 3.5 Tarp in this PDF document on ALPKIT.COM. Although they show a bike and its wheel being used to support the tarp, you could of course so the same thing with trekking poles or similar. bearbonesbikepacking.blogspot.co.uk also has some examples of how you can setup the Rig 3.5 ...
Your most practical solution would seem to be a wing shelter. For the most part, you simply need your tarp, a tree, sticks and rope. The pdf I attached recommends making it 5 feet tall, but you could easily make it 2 or 3 feet tall to accommodate the length you need the shelter to be.
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