Original Zenbivy Bed

35 degree down alps mountaineering quilt. 1.5 pounds. Maybe the best piece of equipment that company has ever made. Or a zenbivy 25 down same weight. Depends on how windy, how much other clothes a I want to wear. Get off the ground if you can with a cot- car camping. Way warmer as the ground is 10x denser than air and sucks the warmth into the ground. A cot also offers better ventilation and you will have to practice venting vs cold.  At some point it will be too cold for you in a 3 season tent and go with a warmer sleep system-   insulated mat with a good r value, wool liner, light wool gloves and balaclava, 0 bag, new tent. Hot water bottle wrapped in your thickest sock stuffed in your bag! Like the folks say here- new dry clothes on a dry body in a dry tent. I've slept in cold on purpose and some really horrible mistakes have been made. 41 is entering the cold zone. 

I have a Zenbivvy Bed with 40 synthetic, 25 down and 10 down (fahrenheit) quilts. Their temperature ratings are comfort ratings. I have slept out with the 25 degree quilt in 25 degree weather and have been toasty warm. And the bottom sheet has a down hood. I would absolutely recommend this system to anyone, especially wider folks and side sleepers.

It's not the lightest. It's not the cheapest. But I sleep in the ground probably 40-50 nights a year and I appreciate the extra comfort.

Any thermarest bag is a good start and I've just tried out the ZenBivy and so far absolutely love it. Would also say that a good sleeping mat goes a long way to keep you warm. You could have the best bag for the cold but a weak mat can undo all the work of a good bag!

I have a zenbivy and I love it. Don’t know what their lowest temp rated bag is though

Agreed. As a thrashing side sleeper this bag has been a godsend. It’s super versatile

Zenbivy - best of both worlds! I have the 10f and 25f light beds and they're super comfortable.

Zenbivy is the best of both worlds. Most comfortable camp sleep system ever IMO.

They’re constrictive and you get twisted up inside the lining if you move in your sleep. Zenbivy came up with the solution to this and other problems.

Sierra Designs has or had one recently. I tried it out but didn't like it much and ended up going with a Zenbivy which is exactly what I hoped it would be.

if you're worried about being cramped maybe try the [zenbivy](http:// https://share.google/tGLl4cDuNv4Fhm4ng)?

Zenbivy. Especially if you’re anything but a back sleeper.

I regret the money I spent on my Zenbivy, I get so cold in it.

Try a Zenbivy, it combines the best features of a quilt and sleeping bag, once I tried one I did not go back to sleeping bags or quilts.