>>2435919pic
>>2435928Those are flimsy and keeping a backpack under it isn't possible.
I posted the picture of the Wäfo poncho further up, it's 70€, length can be set to your height or size, can be used as a tarp with the loops and worn in light climbing because of how it's constructed. 400g and fits in the pocket of a cargo pants pocket.
I'm sure there are lighter/cheaper ones, but this one has served me very well in the last years.