markkwrote a review of Black Diamond Twilight Bivy on May 15, 2017
Familiarity: I've used it several times
The price point of this bivy is nice, and in most conditions does the job.
Pros: Packs very small and light. Price.
Cons: The zipper on mine lost some teeth after only a few uses. Spent an hour in light rain and my bag started getting water after about 15 minutes. I would expect at least an hour of rain resistance. I also wish the opening was an inch or two wider, getting in and out was a yoga workout.
If you are looking to try a bivy get this and see if you like it. If you bivy a few times a year on a regular basis consider something else...