Coda Endless Promise Down Mummy Sleeping Bag

For $400 you have a few options, but I would recommend looking at the Nemo Disco bags. Super light, extra warm, and they are shaped for side sleepers. You can also use them with a custom Nemo liner to get an extra few degrees. I LOVE my Nemo bag. I bought 10° bag and use a liner. I’ve been comfy at and just below 0° many-a-night.

Usually when it’s cold out, like 30-10F out I tend to really bundle up and Take my wool blanket to add to my Nemo 10 degree sleeping bag. I always recommend ‘over dressing’ when it’s cold, because you can always strip down if it’s too hot.

As a warm sleeper I would absolutely die in a 15 degree bag if it's 30+ out. I would have to fully unzip it and then struggle to regulate temperature all night. The Nemo gills help a little but they do not help enough if you're a warm sleeper and it's 15 degrees over your bag rating. I have a Nemo 35 degree bag that I use and I've never been cold in it even though the comfort rating is 40. If it's 50+ degrees out it gets too hot. 35-50 is definitely the sweet spot for it. Personally, as long as you're not in dangerously cold conditions, I'd always go with a warmer bag and wear extra layers to bed or have a backup quilt to throw over it in case it actually gets too cold. I've had way more camping nights ruined from having a bag that's too hot than one that's too cold. You can always add layers but once you have to fully unzip your bag because it's too hot you're in a tricky place with temperature regulation for the night. If you're a hot sleeper do not buy a 15 degree bag if you're basically only camping above 30 degrees. I would be looking at a 35 and then also buying a cheap synthetic camp blanket as an extra layer when needed or an only layer for nights that are 50+

Just got back from a winter ascent and camp of a local 4000m peak and I learned I needed some gear improvements. This trip was intended to find me and my climbing partner’s weak spots with our winter mountaineering equipment before we ascend 2-4 6000m peaks in Bolivia in march. # Camping/Sleeping: As far as sleeping goes, it was 20 degrees Fahrenheit with a real feel of 6° (wind) and I was using a 20° Nemo bag which obviously was not warm enough. I wasn’t cold per se but definitely uncomfortable all night which made for horrible sleep. So I need a dedicated winter bag. Other than that, my legs were really the only cold part that night. I had on some lightweight merino base layers and soft shell pants. 1. **What temp would you recommend for a winter and or 6000m+ bag? -15,-20,-40?** Think Denali, Aconcogua, other 6000ers or CO winter ascents. I won’t be doing any 8000m peaks anytime soon so I’ll get a different bag for that when it comes around. **2. For legs, would you rather use a heavyweight base layer, a mid layer, or both?** Since my legs definitely needed more warmth that night, I was looking for a mid layer (think merino sweats) for sleeping when I thought why not just get a heavyweight base layer? My normal layering system for cold is: lightweight base layer, soft shell pants, hard shell for emergency. This works great in the cold but I feel there is something missing when I’m sleeping. HW base layer would work nice but be too bulky when moving maybe vs I could bring merino sweatpants and lightweight base layer and take off the sweatpants for the ascent. # Ascent: Other than those things, I felt pretty warm moving during our ascent the next day despite the 70mph gusts and real feel well into the negative zone. I did notice that my toes were completely numb at certain points. I could probably use thicker socks but it was UL ski socks for me that day! I currently use some mammut kento pro GTX high boots since they’re the only boots I have that support semi-auto crampons. They’re warm but I definitely push their limits in that cold. Otherwise, my fingers were only cold cause I kept pulling them out of my mitts, so I’ll get really nice liners (300gsm wool). **1. Do I really need double boots for 6000m peaks or would something like a Scarpa Mont Blanc work well?** My mammuts are definitely more of a Matterhorn style boot and aren’t too warm so even a Mont Blanc would probably be a huge upgrade but I would rather not get frostbite. These are very expensive though every step up in warmth (MB to phantoms). **2. What socks do you guys use for super cold ascents or winter ascents?** Right now I only use ultra lightweight ski socks but obviously that isn’t the best idea. I’m partial to Darn tough and Smartwool.

I like the Nemo sleeping bags that have the gills. You can open them when it's warmer and zip them up as the temperature drops. Works much better for me than just opening the side zipper, which I find let's too much heat out.