I can't speak for the "flight" bivy but I have an Integral Designs Event South Col bivy that I won't leave home without on my trips. It is extremely waterproof, lightweight, compact, and very breathable because of the Event material. I have gone through some torrential rains backpacking through Arizona during monsoon season and with the bivy completely zipped, have stayed completely dry from the rain, and comfortable. At most I might wake up with a little condensation on my sleeping bag but not enough to where it seeped into the bag. That's the nature of bivys anyways. The only downside to it is the Event bivys are a little pricier, expect to pay about $100 more.

I can't speak for the "flight" bivy but I have an Integral Designs Event South Col bivy that I won't leave home without on my trips. It is extremely waterproof, lightweight, compact, and very breathable because of the Event material. I have gone through some torrential rains backpacking through Arizona during monsoon season and with the bivy completely zipped, have stayed completely dry from the rain, and comfortable. At most I might wake up with a little condensation on my sleeping bag but not enough to where it seeped into the bag. That's the nature of bivys anyways. The only downside to it is the Event bivys are a little pricier, expect to pay about $100 more.

It fits everything you want just fine. If you want a couple amenities you should look at a bivy with a pole or two. BD makes one and so do Big Agnes and OR. They offer a little head room and keep the fabric off you if you have to zip it up during rain, etc. Check out the Black Diamond Lightsabre, for the money it is the best. Two poles and it only weights 3 oz. more. This TNF will work great for what you want though. Good luck and have fun on the trip.