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REI Sub Kilo +15

rated 4.5 of 5 stars

The Sub Kilo +15 has been discontinued. If you're looking for something new, check out the best 3-season down sleeping bags for 2024.

photo: REI Sub Kilo +15 3-season down sleeping bag

This bag was one of my favorite pieces of gear for my 21 days on the the Appalachian Trail. I would recommend it for anyone looking for a good spring or fall bag. I'm 5'9" and 180 lbs and slept comfortably even while ice formed on my rain fly.


  • Lightweight
  • Warm to rating
  • Packs really well
  • Not sweaty like synthetic

I started hiking the Appalachian Trail from Springer Mountain this spring. Started March 27 and traveled 160 miles in 21 days. This bag did great. There were nights I woke with ice on my tent and I still slept comfortably. I haven't used it down to 15 degrees yet, but I believe it could get close. I do sleep warm.

On the trail, I replaced the REI bag it came in with a medium 18 L Granite Gear stuff sack (eVent fabric on the bottom). However, the sleeping bag packed down so well I could have easily used a smaller bag near half that size. I put my sleeping bag on the bottom of the pack and off I went every morning. Every night it fluffed back full and well.

I did take extra care to not let it get wet. Of the 21 days there was rain (at least 48 hrs straight sprinkle and two evenings of downpour) but the sleeping bag didn't know that.

Fit worked well for me. I'm not used to mummy bags. At 5'9" I have had many comfortable nights in the bag. I typically sleep on my stomach with one knee out and bent. I loved being able to unzip the bottom of the zipper to stick one leg out. My top never got cold.  

I'm using it to sleep on the living room floor for a month and it's still doing great. I'm taking extra precautions to protect it from the dogs (nails) but I don't think I need too. The loft is great and fluffy. The materials are holding up and down is staying inside the bag.  

Source: bought it new

The best bag I have ever had!!!!!!! Without a doubt, I will never buy another bag again. I went on a backpacking trip on Independence Day last year!! It rained ALL night, and I never got cold once. That was in 20 degree weather also.

It is super lightweight and very easy to pack down into a stuff sack. With a compression stuff sack, I can get it down to almost the size of an REI water bottle. The down in it makes it very silky and light and very comfortable to sleep in. The second I bought it, I just wanted to snuggle with it.

Best of all, with other bags, the down floats to the bottom of the bag, with the Sub Kilo, it stays at the top all night long! There were no cold spots in the bag at all. This was a great purchase and I love it!

Design: mummy
Fill: 750 fill down
Temperature Rating: 20F
Weight: 1.5 lbs
Price Paid: $159.93

I love this bag. Besides it being beautiful and soft as silk (it's made with taffeta, what they make prom dresses out of), it shrinks down in its compression bag to the size of a Big-Gulp. It is very warm and I usually have to unzip. The top strings and zippers can be a little unnerving at night in the dark, so learn what each one does before you go to sleep. The foot box is extra warm and bigger than a regular mummy bag. Excellent choice!

Design: somewhat mummy
Fill: 750 fill down
Temperature Rating: +15
Weight: 1.8 lbs
Price Paid: $239

I love this bag. Like the other lady said - the texture is SUPER soft and snuggly. You really want to crawl into it. :) Also it packs down to absolutely nothing. I did camp in teen weather and was still very cold, so I'll try a liner with it next time.

Design: mummy
Temperature Rating: 15 degree
Price Paid: $239

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regular long
Price Historic Range: $79.83-$208.73
Reviewers Paid: $159.93-$239.00
fall 2010
regular long
Weight 1 lb 15 oz / 880 g 2 lb 0 oz / 910 g
Temperature rating 15 F / -9.4 C
Fill 750 fill-power down
Shape mummy
Max user height 5 ft 6 in / 170 cm 6 ft 0 in / 180 cm
Shoulder girth 56 in / 140 cm 57 in / 140 cm
Hip girth 54 in / 140 cm 54 in / 140 cm

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