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One thing to understand is that, 99% of the time, you're really not intended to use the thin or thick bag by themselves - they're meant to be covered with the bivvy cover, to protect the bag from wind, dirt, moisture, etc. The bivvy cover is waterproof/water resisitant, and made of a material that you can really just brush dirt off of, whereas the bags themselves will sponge up muddy water, wind will cut through them, and dirt will be a pain to get off. It also makes it a few degrees warmer. Just my 2 cents.
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