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Cuben fiber itself is expensive which is where most the cost is coming from. Depending on your design constraints, for the money you're probably best off just using a heavy duty trash bag or two with built in handles to get you through a week (obviously not a thru-hike usage model).
If not silnylon is going to be a durable solution, but there are concerns about just how "waterproof" it is. For walking it should be fine, but sitting on a wet log or ground will probably leave your butt soaked.
Good luck!
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