Big Agnes Lost Dog 15 Sleeping Bag

Item No. 10627-BLD1519
$189.95 - $199.95
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Product Description

Big Agnes System bags with FireLine™ ECO synthetic insulation offer a roomy, rectangle-shaped sleeping space with an integrated Flex Pad Sleeve on the bottom. With technical fabrics and construction, 100% recycled, super-warm insulation, and tons of comfort features, these comfortable sleeping bags are designed to be lightweight enough for backpacking but cozy enough you'll want them in the campground too. The streamlined silhouette and Flow™ construction increase the thermal efficiency keeping you warm from head to toe. The Flex Pad Sleeve unites easily with your pad, and as you change positions over the course of the night, will keep you from rolling off your pad.

Customer Reviews

4.7 / 5.0
6 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Enjoyed the room it had and also the ability to attach my pad.
August 10, 2020
Originally posted at
Rated 5 out of 5
Great bag! Comfortable, warm, and light
This is a very comfortable bag. I went with the long bag. I'm 6'1" and its comfy but still light enough to pack. I love it, and especially being able to fix my pad into the back. #sweepstakes
August 6, 2020
Originally posted at
Rated 5 out of 5
Great Bag, with room for larger people
I purchased this after discovering that many mummy bags are designed for very narrow people... and that's not me! I spent more than an hour in an outdoor specialty store "trying on" bags after disovering that the "deal" I got on one bag was because I was buying a straight jacket. The Lost Dog is most definitely NOT a straight jacket. I can move around in it, get comfortable... and I stayed nice and toasty warm on nights dropping into the 20s. When I add the Wedgie Bag Expander, it's almost luxurious, and I can really settle in comfortably. These are one the few bags I found with a 70+ inch shoulder girth.

Realize you will need a sleeping pad for these bags; read up on the Big Agnes Sleep System for details -- and it's nice that they're now (after I bought my bag and the inflation sack separately) including an inflation sack. That's another great accessory...
April 22, 2020
Originally posted at
Rated 5 out of 5
Excellent product
I used the 0degree on a 10 day camping adventure. The system worked great with the pad/bag combo. I slept comfortably and warm every night. The hood with pillow sleeve (I used a sweatshirt) was a nice feature. I was a little surprised at the amount of bulk, but that could be fixed with a better stuff sack. Best bag I have used!
March 6, 2020
Originally posted at
Rated 3 out of 5
Now insulation on underside?
Why is there no insulation on the bottomside of the bag?

I sleep with this bag in a hammock and it was miserable. Only then did i realize the bottom of the bag is just a lining. What? Why?
December 17, 2019
Originally posted at
Rated 5 out of 5
I'm so happy I got this bag
I bought this sleeping bag for my up and coming section hike of the AT. And I didn't realize how attached I could become to a sleeping bag. First off, the it's bright sunshiny vibe!! Second, I'm 5'7" and a little voluptuous in the hip section, so I got the long wide version.....excellent choice!! It leaves plenty of room for me to move around even when zipped (not all the way up because I might have to throw my leg flashes...did I mention I'm 49??!!). And thirdly (is that even a word), I'm somewhat of a cold sleeper (except for the occasional hot flash) and this 15 degree bag nails it!!!! Big Agnes, hands down, this is my favorite sleeping bag I've ever owned. And I do not see me ever owning anything else....except maybe a new Lost Dog 15 wide long, when this one wears out of course!! Thank you for making such an incredible product that not only performs for everything you need it too but also for the durability and COMFORT!! I LOVE this bag!!!
July 6, 2019
Originally posted at