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Big Agnes
Lost Ranger UL 3N1 Sleeping Bag: 15F Down

2 out of 5 stars
2 Reviews



Why We Like The Lost Ranger UL 3N1 Sleeping Bag

Summer camping can lead to some Goldilocks-style discomfort: bag on, way too hot, bag unzipped, suddenly we're getting blasted with cold midnight breeze. Luckily, with the inspiration of the most versatile jackets out there, the Lost Ranger UL 3N1 Sleeping Bag is just right. Two sleeping bags—one in a lofty, lightweight rectangular shape and one mummy modeled after Big Agnes's Sidewinder bags—can be slept in together to offer cool-weather warmth when we need it and used apart for hot summer nights.


  • Three-in-one sleeping bag offers three-season camping comfort
  • Together, 15-degree rating provides warmth in the shoulder seasons
  • When used separately, each bag is ideal for summer weather
  • Water-resistant Downtek insulation stays lofty in all conditions
  • Pad retainer cinch with built-in pillow barn for secure comfort
  • Outer bag's corner pockets allow blanket-like wrap-around snuggling
  • Hood on inner bag offers additional warmth on breezy nights
  • Sidewinder inner bag shape offers comfort for side and back sleepers
  • Item #BAGZ2C1
nylon, PFC-free water-repellent coating
850-fill DownTek (down, PFC-free water-repellent coating)
[outer bag] semi-rectangular, [inner bag] mummy
two-way, 3/4-length
Max User Height
[regular] 6ft, [long] 6ft 6in
Shoulder Circumference
[outer bag] (regular) 69in, (long) 72in, [inner bag] (regular) 62in, (long) 65in
Hip Circumference
[outer bag] (regular) 61in, (long) 64in, [inner bag] (regular) 54in, (long) 57in
Foot Circumference
[outer bag] (regular) 55in, (long) 58in, [inner bag] (regular) 43in, (long) 46in
Bag Length
[regular] 6ft, [long] 6ft 6in
Draft Tube
[outer bag] no, [inner bag] yes
[outer bag] 2 hand, [inner bag] none
Pad Retainer
[outer bag] Pad Cinch System, rectangular pad recommended (20 - 30 x 72 - 78in), [inner bag] no
two-way zippers
Fill Weight
[combined bags] (regular) 15oz, (long) 17oz, [outer bag] (regular) 7oz, (long) 8oz, [inner bag] (regular) 8oz, (long) 9oz
[combined bags] 15F, [outer bag] 50F, [inner bag] 35F
European Norm/ISO Comfort Rating
[combined bags] 28F
European Norm/ISO Lower Limit Rating
[combined bags] -17F
Storage Sack
Stuff Sack
compression sack included
Stuff Size
[stuff size] 8 x 17.5in, [compressed size] (regular) 8.5 x 8in, (long) 9 x 8.5in
Claimed Weight
[combined bags] (regular) 2lb 3oz, (long) 2lb 6oz, [outer bag] (regular) 1lb 2oz, (long) 1lb 4oz, [inner bag] (regular) 1lb, (long) 1lb 2oz
backpacking, ultralight backpacking, weekend camping
Manufacturer Warranty

Overall Rating

2 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 2 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 0 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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2 out of 5 stars

May 28, 2023

Not Impressed

I've used it several times
Size Bought:
6' 1"

The idea is great the outside bag works well enough, the way it wraps around the mattress and the pillow barn are a nice touch. It also packs down pretty small. It seems like a warm system but I didn’t get to put it to the test because the 2 nights I used it, it only dipped down in to the 30s. Now for the inside bag it is garbage. There isn’t a draft tube in the bag, which I wasn’t a fan of. It’s main downfall is the zipper, it gets stuck on its fabric and the outside bags fabric.When it isn’t hanging up on the fabric it just doesn’t work! You have to hold everything exactly right or it won’t unzip. Which can be very frustrating when you have to get out of the tent in the middle of the night and you have to fight the zipper for 10 minutes just to get out of your bag.(this happened multiple times). Very disappointed by this product by Big Agnes.

Mitch M
2 out of 5 stars

December 2, 2022

For the price, no.

I've used it once or twice and have initial impressions
Size Bought:
5' 10"

The mummy bag is to small. I'm not a big guy, I could barely get my shoulders flat on my mat. The zipper on the mummy bag is trash. It constantly gets caught in the fabric and is a real pain to open from the inside of the bag. The blanket did strap down to my mat very well. Pillow holder is also a nice touch. The zipper on the blanket works great. It did keep me warm, 24 degrees overnight in a 15 degree bag.

William L