NEMO Equipment Inc.

Sonic 0 Sleeping Bag: 0F Down

Best 0 Degree Bag I've Owned!

I recently purchased the 0 degree bag for a bike-to-ski trip in Iceland, so I needed it to work in a variety of conditions (cold, wet, snowy, windy, you name it), and be versatile enough to pack into panniers, backpacks, and beyond. The bag was perfect and outperformed my expectations. I stayed warm on cold nights and loved the ability to open the gills for added breathability, which was crucial in never feeling too swampy if it was a warm night. I ended up swapping the stock stuff sack for a waterproof compression sack, and it packed down quite small for a 0 degree, fitting well into my panniers and 35L backpack when skiing. I'm 5'9" and the regular length fit me well - my pillow tucked very nice and snugly into the hood, so sleeping was always quite comfy and cozy. No complaints, issues, etc. Happy customer here!

Meh Performance at 0 Degrees

Familiarity:

I've used it several times

Size Bought:

Regular

Weight:

210

The Nemo Sonic 0 Degree Sleeping Bag is a neutral performer. While the Nemo Sonic 0 Degree Sleeping Bag has awesome features and the best draft tube I have ever tested, it still did was not in the top percentile of all the sleeping bags I have tested. Using USDA certified thermometers, it only got up to 79 degrees on the inside of the bag. When compared to Therm-A-Rest Parsec, Feathered Friends Ibis ES and Mountain Hardware Bishop Pass GoreTex, it was well below those bags 82+ degree performances. Budget or expensive, it was just meh in terms of warmth performance. With all that being said, the Nemo Sonic 0 Degree Sleeping Bag would most likely work well from 10 degrees up to 40 degrees since it has the venting option. But I would not take it below 10 degrees. Also, if you are 5'11" or above, do not get the regular. I am 6' and it was short for me, causing my feet to be cold at 8 degrees.

Fall in Alaska

Worked perfectly for a fall bear hunt in Alaska. I am 6’1” and purchased the XL and in was nice with a little length to spare.

Outstanding sleeping bag

I bought this in time for my 4 day solo backcountry hunt. Temperatures were projected to be in the mid teens at night, but a cold snap occurred and dropped down to single digits (Fahrenheit). This bag saved my trip. It was so warm that I was able to sleep in my boxers. I'm 6'2" tall and 230 pounds. The long bag allowed for plenty of space to move freely. My size 14 feet didn't feel cramped in the toe box. Condensation in the morning was easily brushed off with a towel in the morning and the bag always dried quickly. I don't think the insulation ever got wet. The baffle cinches with an elastic cord and traps in the heat. The gills did a great job of regulating heat. I think it packs down to a reasonable size with the stuff sack, and I think the stuff sack was well-matched. I don't believe I could have compressed the bag much more. There's a pocket near the zipper, just below the face opening. This fit my Iphone 12 mini, but I don't think it would fit anything much larger. I have suggestions for the design in the future. Because of the wallet/phone pocket's location, in the morning, it was usually covered with condensation. This made trying to open the pocket only slightly more difficult, but was still annoying to deal with the cold and damp. It's also not accessible unless I were to open the main zipper and let out heat. I'd prefer a pouch, interior to the bag. This way it's insulated from freezing temperatures. The baffle velcro could be a bit stronger too, or designed to sandwich between flaps for better purchase. But these are very minor issues. What matters most is that the bag is warm, roomy, dry, and of a reasonable weight and pack size. Having this bag has opened up so many more opportunities for cold weather outtings that I cannot wait to explore.

I like everything about this bag

Very warm, just the right amount of room for me, zipper works very well, thermal gills work great. I have been sleeping in bags for 60 years and this is my favorite

This is not a 0 degree bag.

Familiarity:

I've used it once or twice and have initial impressions

Size Bought:

Regular

Weight:

200

Do not take this out for anything less than 30F. You will be cold. There?s no way this is a lower limit of 0F. Lower limit of 15, maybe, and I?d imagine I would be shivering. This is a 30F bag all day every day. The baffles are 2.5? thick. Something is seriously wrong with these bags.