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Big Agnes Mystic UL 15 Sleeping Bag
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The Mystic UL 15 is one of our most technically designed Big Agnes System bags, using our Flex Pad Sleeve design, a very durable nylon ripstop shell fabric, and super cozy 850 fill power DownTek water repellent insulation. This bag combines ultralight versatility with a long line of packable creature comforts. Whether you're a 3/4 length-pad-carrying, fast fly tent-gram-counter or just gearing up for a trip where weight and packed size is important, this is the go-to bag for you.
Anyway, yep, bought 10 years ago, still going strong. Have spent over a year in this thing, if not two. Draft tube keeps zipper from getting snagged, just be smart about it. Still has loft, barely has lost any feathers, although occasionally see some here and there now. Can't speak of newer models but 10 years and still going strong. Love how it attaches to my sleeping pad, never had an issue. Perhaps I see myself getting a 2nd lighter/smaller bag but so far no need, although tempting.
This bag as paid for itself and then some on a few trips in the mountains, on the coast, backpacking, and in the dessert, and in the snow ....a few summer nights I had to sleep on top of it and then get cozy in it after it cooled off. In a bivy, a little condensation as expected or a, few other nights when moisture got it wet I still stayed warm.
Overall, not too hot, not too cold, this a Goldilocks bag, super cozy. I've slept out under the stars without a tent and this thing as kept me company. FYI- Male, 6' thin body type.
Some people have grand expectations for gear or a sleeping bag, I'm not sure if I did or I always enjoyed a good night's sleep. I do now though, go hard, play hard, and sleep soundly.
I got it because I had a TNF bag... I believe it was a "plover"... this is back in the early 90's (Not to be confused with FF's Current Plover... it had a sleeping pad pocket on the bottom of the bag... which kept you from rolling off the pad. I LOVED IT... took it to Nepal for a couple months and simply loved it... but it was on the heavy side so I left it there as a gift for a Sherpa Friend... Back state-side we don't have porters so I stuck to lighter weight bags (Western Mtneering)
Fast forward and I see the Mystic and I decide to try it out. Its awesome, fantastic concept... BUT NOT a 15º bag. I don't care what your R rating of your pad is, what your evening calorie intake was or how you measure convective heat-loss due to air.... OR what you're wearing... it aint no 15º bag.
So... great bag, great concept... but I only take this thing out when its dropping into the 40s... anything more and I grabbing one of 3 or 4 other bags who's ratings are more on the 'true' side. Great SUMMER bag... NOT a shoulder season bag.
I'd be mindful of some of the reviews on this website. Many people misunderstand the temperature rating systems for sleeping bags. Some folks think that just because a bag is rated to 15º that everyone in the world will be fine sleeping in it at 15º. No manufacturer in the world would guarantee this. We all have different furnaces running at different rates. All gear is trial and error and it's important to test your gear before the big trip.....not on it. Just saying...it's too bad that some reviewers don't consider things more fully before commenting. I trust Big Agnes and their team of ninja testers.
I'm a little over 5'10", but I took a chance on the regular size (which is recommended up to 5'10), and I still had plenty of room at the end. I bet it would work for somebody 5'11 or even a little taller...but don't blame me if your toes touch the end. It feels a lot roomier than a mummy bag, and because it's attached to the pad, you can shift around, sleep on your side, and roll over, and it doesn't get all twisted or slide off the pad. I found it much more comfortable - a bit like a bed with a duvet. Overall I really like the bag, and I think it's a good choice for trips where you don't expect things to get too cold. I bet the warmer Blackburn would also be a good choice.
First, lets go over the PROS.
I really like the sleep system. I'm a side sleeper who tosses and turns all night. The sleep system did exactly what I was hoping it'd do. It kept me on my pad and the tossing didn't result in letting in a cold draft. This is main reason I didn't get a quilt system. I'm afraid my constant tossing will let in cold drafts.
Now the 2 main cons.
1st, the pillow strap is useless. The hood just isn't big enough to fit your head and a pillow inside. Maybe a puffy jacked or fleece but not an inflatable pillow. I use a Sea to Summit pillow and once it's in there, your head sticks out of the hood. I had better luck with the pillow outside of the hood wedged in between the pad and bag. The sleep system keeps the pillow nicely in place.
THE MAIN CON.
This is not a 15^ bag. The first night got down to 27^ and the second night 29^. I was not comfortable and kept waking up. First night, I had a sleeping bag liner, thermal tights, and tech t-shirt. Ended up putting on a lightweight fleece and neck buff around 4am.
At 15^ above the rated temp, I should have been pretty comfortable. Second night, I wore 2 pairs of wool socks, thermal tights, hiking pants, tech t-shirt, quarter zip long sleeve, lightweight fleece, buff, and sleeping bag liner. My upper body was warm the second night but my legs and feet were still cold. I could feel the chill coming from above.
When I'd toss at night, I'd feel a thin line of cold where the pad meets the bag, but that wasn't a big issue. Not a lot of cold seeped in. It was mostly just feeling the chill from directly above. I would have to be in full down pants and jacket to even try this bag at 15^.