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If you're comparatively high speed, consider a poncho and poncho liner. Search for "woobie". For a warm and waterproof sleeping system you can just wrap yourself inside of the poncho and woobie. I've used this technique to replace a sleeping bag for most of my military career and plenty as a civilian. It might not be suitable for very cold climates, but if you have some gravel in your gut you can use it for three seasons just about anywhere in the world.
Obviously you should wear the poncho during the day if it starts raining or something.
