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Just experimenting for the time being. My 2.5kg tent would suffice, but I want to see about roughing it with the bivi bag for the first time in years. A tarp is just an extra, so it’s more about whether a 3x3 is a better size to set up proper.
As far as options for purchase, I have oodles of ripstop material so I’m keen to DIY for now.
pdlouche-
I bought an Outdoor Research Molecule Bivy for bike packing and to be honest I didn't really like it at all... I also bought a bundle of cord and a bag of those little cam tightener things like this and I reckon you could fashion something much more pleasant out of them with a bit of tarp, presumably there's some sort of lightweight option available that packs small?
Nice thing about the cord and cam tighteners would be that you could conceivably rig up a hammock too? That's certainly the way I'd go anyway...
Nahguavkire
I would never use one ever. tipping over, heat from the engine, gross place to be, crappy shelter anyway.
It's not that hard or expensive to set up a complete tarp or even carry a legitimate tent/bivy.
They have acceptable shelter tarps on Amazon and MSR has great poles for the Cost of of beers and dinner.