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  • Unique welded construction reduces weight and bulk, maximizes insulation loft, eliminates cold spots and thermally maps insulation to areas where warmth is needed most
  • Thermal.Q insulation has outstanding compressibility, maintains excellent loft and continues to insulate even when damp
  • Comfort mummy fit offers room to move while remaining thermally efficient
  • Ergonomic draft collar and tailored hood with face gasket comfortably block drafts and seal in warmth
  • Comfort footbox follows natural foot position for maximum warmth and comfort
  • Soft polyester lining wicks away moisture and lightweight nylon shell has a durable water repellent finish to ward off moisture
  • Full-length #5 zipper with double sliders for versatile ventilation
  • Zippered pocket at shoulder
  • 34³F EN (European Norm) comfort rating is suitable for 3-season use
  • Nylon compression stuff sack and mesh storage bag included


View all Mountain Hardwear Women's Sleeping Bags

REI membership


Best Use Backpacking
EN Lower Limit 23 degrees Fahrenheit
EN Comfort 34 degrees Fahrenheit
Temperature Rating (F) 34 degrees Fahrenheit
Temperature Rating (C) 1 degrees Celsius
Long Right
2 lbs. 10 oz. ounces
Regular Right
2 lbs. 7 oz. ounces
Shell 30-denier ripstop nylon
Zipper Location Right
Insulation Type Synthetic
Fill Thermal.Q synthetic fibers
Fill Weight 1 lb. 7 oz.
Lining 40-denier polyester taffeta
Sleeping Bag Shape Mummy
Fits Up To (in.)
Long Right
72 inches
Regular Right
66 inches
Shoulder Girth (in.)
Long Right
60 inches
Regular Right
58 inches
Hip Girth (in.)
Long Right
59 inches
Regular Right
53 inches
Stuff Sack Size 7 x 14 inches
Stuff Sack Volume
Long Right
10.2 liters
Regular Right
10.2 liters
Compressed Volume
Long Right
Regular Right
Gender Women's
Rated 5 out of 5 by from Great Bag This bag repelled water when needed, kept me warm in the 30's, and stuffs down very well for backpacking. This is a great bag if you use it correctly. Mummy bags work by using your body heat to keep the inside warm. I made the mistake of sleeping with my warm soft slippers along with my wool socks and my feet got cold. The next night I slept with only my wool socks on and my feet stayed warm. I made the mistake of layering my socks on a another trip, and halfway through the night took off my extra pair of socks and my feet warmed up. If you have too many layers on it will be cold. I am a bit shorter and need to pull this bag up around core so my feet can reach the bottom....also key to keeping your feet warm.
Date published: 2016-07-09
Rated 4 out of 5 by from Nice Sleeping Bag for Warmer Conditions I purchased this bag for my wife, primarily for backpacking. The bag was very lightweight and compressible (as compared to the bags we use for car camping), and appeared well-made. Ultimately, though, it was just not warm enough. I figured the 34-degree rating on this bag would be sufficient for any of our adventures (we're unlikely to tackle cold conditions). However, when late March temperatures dipped to the mid-40s overnight, my wife ended up stealing my bag to stay warm (my bag is rated for 20 degrees). So, we ended up returning this one, but will be looking at the Z Flame or Z Torch.
Date published: 2016-04-14
Rated 3 out of 5 by from good entry level bag for backpacking Pros: For the price range, this bag is a great choice. It's inexpensive enough, light enough, comes with a compression sack and packs small enough, and is warm enough for most 3 season camping. I've used it on 2-6 day trips, doing up to 15 miles a day; have been warm in temps in the upper 30s. Cons: I never slept well on backpacking trips, and am realizing that the mummy shape is too constricting for me, since I often sleep on my side and there's not a lot of room for different leg positions. If you're looking to go ultralight, this is a good entry level bag, but you'll probably end up wanting something a little lighter eventually. =>My all-time favorite bag is the Nemo Aria 35, which for slightly more money is similar in weight, but mind-blowingly more comfortable.
Date published: 2016-10-27
Rated 5 out of 5 by from Highly recommend I used this sleeping bag on a 3 day, 2 night backpacking trip in Mount Rainier National Park. It got very chilli at night but as soon as I slipped into my sleeping bag, within minutes I was warmed up and felt great. Super comfortable and very fitting. Stuffs nicely for the occasion. Had no problems.
Date published: 2016-07-05
Rated 3 out of 5 by from Brrrr, not warm enough Took this out backpacking in June in Oregon- definitely not warm enough. Will return it. Love the weight, compressibility, seams - but will not work for me. Was 40 degrees out and we have a nice REI tent.
Date published: 2016-06-13
Rated 5 out of 5 by from Quality product on a budget. I went into my local REI to buy a bag. I told the sales rep that I was a fairy novice backpacker looking for something versatile, durable and for moderate temperatures, but one that wouldn't break the bank as a college student. Without hesitation he recommended this bag. Going through the bag, he pointed out some of the features that made it perfect for me. First of all, it is a higher temperature rating, so while it is easy to add liners that would make it more appropriate for even colder weather, it is harder to take away temperature to use in warmer months. Second, it is fully synthetic so that it is undamaged by moisture the way that down would be. The synthetic also makes it cheaper, ultra lightweight, and compact. In fact, the sales rep sold the men's version of the same bag to another young backpacker directly after me. I got to test this bag out for the first time this weekend and it was perfect. It is soft, plushy, comfortable, and lightweight and it compresses so well that it fits in the sleeping bag compartment of my backpack with room to spare. In the evenings it got down in the high 40s and I was perfectly warm and comfortable the entire night. I'm 5'5 and I went with the smaller size and it fit me perfectly, although if I was any taller at all I would go with the longer size. Would definitely recommend!
Date published: 2017-03-26
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When compressed as much as possible, how big is the sleeping bag? Is it as big as a football, or a gallon of milk?

Asked by: AKgirl907
Fully compressed, the Laminina Z Spark Sleeping Bag measures approximately 13 x 8.5 inches.
Answered by: REIservice
Date published: 2016-09-08

Will the Regular RIGHT WOMENS bag connect to the men's Lamina Z Spark LONG? 

Asked by: Blaisin
Yes, a women's regular Laminina Z Spark Sleeping Bag will mate with a men's long Lamina Z Spark Sleeping Bag.
Answered by: REIservice
Date published: 2016-11-03
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