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If you’re looking to save weight, a goretex bivy is about the same weight or an ounce or two heavier than a dyneema tent. The advantage of the bivy is that it packs down to half the size and is half the cost. Obviously a tent is better for sleeping in though. If you have the money and packable space isn’t an issue, I’d go with a tent. Pic extremely related (zpacks duplex and an OR alpine bivy)