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Patagonia Lightweight Sleeping Bag Review

A feather-light mummy sleeping bag that hardly supplies enough warmth to be useful
Patagonia Lightweight Sleeping Bag
Photo: Patagonia
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Price:  $200 List
Pros:  Reasonable price, rock-bottom weight, simple design
Cons:  Disappointing warmth, cramped dimensions, limited versatility
Manufacturer:   Patagonia
By Jack Cramer ⋅ Review Editor  ⋅  May 5, 2021
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55
OVERALL
SCORE


RANKED
#15 of 15
  • Warmth - 30% 3
  • Weight - 25% 10
  • Comfort - 20% 4
  • Versatility - 15% 6
  • Features - 10% 4

Our Verdict

When we saw the specs for the Patagonia Lightweight Sleeping Bag our hopes soared. Just 9.8 oz for an affordable "sleeping bag"?!? When we laid our hands on one, however, our hopes were dashed. Its meager quantity of 40-gram Primaloft Gold insulation is simply not enough to supply meaningful warmth. Sure, it's light and it packs down incredibly small, but it's difficult to imagine a situation where this model could function as a useful standalone sleeping bag. It does make sense as a liner bag to boost the temperature rating of another sleeping bag on a cold night. But in temperatures hot enough for you to possibly desire this bag's tiny level of warmth, we think you would probably be better off with no sleeping bag at all.

Compare to Similar Products

 
Awards  Editors' Choice Award Best Buy Award Best Buy Award  
Price $200 List$399.00 at Feathered Friends$300 List$180 List$165 List
Overall Score Sort Icon
55
73
72
60
60
Star Rating
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Pros Reasonable price, rock-bottom weight, simple designHighest scoring ultralight sleeping bag, best features, and most versatileVery affordable, highly customizable, versatile, lots of featuresVery inexpensive, versatile, good feature setExtremely lightweight, affordable, insulation retains warmth when wet
Cons Disappointing warmth, cramped dimensions, limited versatilityNot as warm as others (in the version we tested), neck draw cords loosen over timeLong wait for product to be custom made and shipped, foot box draw cord still leaves a little hole, lots of buttons and strapsNot as warm as similar quilts, doesn't seal at the bottom very wellUnderwhelming warmth, narrow dimensions, weak closure snap
Bottom Line A feather-light mummy sleeping bag that hardly supplies enough warmth to be usefulThe highest scorer because of its versatile design that allows it to be a fully opened blanket or a fully zipped hoodless mummyOffers the versatility of sleeping under it as a blanket or fully wrapped up, with a huge range of customizable optionsA quilt with good features at an unbeatable priceThis affordable quilt is extremely light and ideal for ambitious summer missions
Rating Categories Patagonia Lightweight Feathered Friends F... Enlightened Equipme... Hammock Gear Burrow... Mountain Laurel Des...
Warmth (30%)
3.0
7.0
9.0
6.0
4.0
Weight (25%)
10.0
5.0
5.0
3.0
9.0
Comfort (20%)
4.0
7.0
6.0
7.0
6.0
Versatility (15%)
6.0
10.0
8.0
8.0
6.0
Features (10%)
4.0
10.0
8.0
8.0
4.0
Specs Patagonia Lightweight Feathered Friends F... Enlightened Equipme... Hammock Gear Burrow... Mountain Laurel Des...
Style Hoodless, zipperless mummy Center zip mummy bag or unzipper to be quilt Quilt Quilt Quilt
Manufacturer Stated Temperature Rating Not listed 40F 20F 20F 40 - 50 F
Measured weight, bag only (ounces) 9.8 oz 19.1 oz 20.9 oz 25.0 oz 11.2 oz
Claimed weight from manufacturer (ounces) 11.8 oz 20 oz 20.19 oz 22.19 oz 11 oz
Stuff Sack Weight (ounces) 0.4 oz 0.8 oz 0.6 oz 0.6 oz 0.6 oz
Stuffed Size 6" x 7.5" 7" x 10" 7" x 12" 6" x 10" 7" x 16"
Fill Weight 6 oz 8.4 oz 13 oz 13.18 oz 2 oz/sq yd
Fill Power 40-gram PrimaLoft Gold insulation with Cross Core 950+ goose down 850 Downtek 800 fill duck down Climashield Apex Insulation
Construction Baffleless synthetic insulation. No hood, no zipper Continuous baffles U shaped baffled quilt Box baffle consruction Baffleless synthetic insulation. No hood, no zipper
Shell Material 10D shell Pertex Endurance UL 10D nylon fabric 20D nylon taffeta 10D MLD Mountain 3XDWR
Shoulder Girth (inches) 52" 62" 55" 55" 53"
Hip Girth (inches) 47" 48" 55" 50" 48"
Foot Girth (inches) 36" 39" 55" 45" 38"
Zipper Length No zipper Full length center zip 1/3 length at bottom 1/3 length at bottom No zipper
Sizes M, L Regular, long, and wide Short/regular, regular/regular, regular/wide/ long/wide Short, standard, long, wide-short, wide-standard, wide-long S, M, L
Temp Options (degrees Fahrenheit) One temp fits all 20, 30, 40F 10, 20, 30, 40F 0, 10, 20, 30, 40F 45F

Our Analysis and Test Results

Performance Comparison


The ideal situation for the Patagonia Lightweight Sleeping Bag is a...
The ideal situation for the Patagonia Lightweight Sleeping Bag is a warm summer night when you hardly even need a sleeping bag.
Photo: Jack Cramer

Warmth


Patagonia chooses not to assign their Lightweight Sleeping Bag a temperature rating. If we had to give it one, we would estimate it at 60F. This lack of warmth is a consequence of this bag only featuring a thin layer of Primaloft Gold for insulation. It's simply too thin to contain much body heat. This model could serve as a useful liner bag to boost the temperature of another sleeping bag, but in the hot summer temperatures where it might be acceptable on its own, we think you're better off with a puffy jacket and insulating pants, or maybe an emergency bivy.

It's easy to see that the Patagonia Lightweight Sleeping Bag's...
It's easy to see that the Patagonia Lightweight Sleeping Bag's Primaloft Gold insulation (left) doesn't offer nearly as much loft as premium, 950 fill power goose down (right).
Photo: Jack Cramer

Weight


When we laid a size Regular on our scale, we weren't sure if the reading was right. We had never seen a sleeping bag weigh less than 10 ounces. This model checked in just under at an insane 9.8 ounces. This is certainly impressive but we would like to caution this product doesn't provide anywhere close to the warmth of an ordinary sleeping bag. In fact, we think its overall warmth-to-weight ratio is worse than an average sleeping bag.

If you're still tempted though, we can report that its included stuff sack is also very light at 0.4 oz. We think this sack is sized nicely for compressing the bag. However, we would not use the secondary drawcord that expands the sack and allows it to be used as a storage sack. Instead, hang the bag up while storing it and you will preserve what little loft it has.

Weight is a critical aspect of any outdoor gear, but it's...
Weight is a critical aspect of any outdoor gear, but it's particularly important to ultralight travelers.
Photo: Jack Cramer

Comfort


This zipperless mummy bag is constructed with a subtle taper from the shoulder to the foot of the bag. The dimensions are predictably narrow, especially at the footbox. Although our testers liked the feel of its 10-denier nylon fabric, they still scored its overall comfort at well below average. This bag is so minimalist that it only seems suitable for single-night missions, where the fatigue level rises so high that you could sleep in practically anything.

The Lightweight Sleeping Bag from Patagonia packs down to roughly...
The Lightweight Sleeping Bag from Patagonia packs down to roughly the size of a one-liter Nalgene bottle.
Photo: Jack Cramer

Versatility


One advantage that this bag has over many other ultralight sleeping bags is the ability to maintain its warmth even if it gets wet. That's a consequence of its synthetic Primaloft Gold which won't clump like down feathers if the rain starts to fall. The low-profile design of this model also means that it can function well as a sleeping bag liner to boost the warmth of another bag in cold conditions. In fact, we think being a liner bag is probably this model's ideal use.

In other ways, the Patagonia Lightweight Sleeping Bag is less versatile. The zipperless design means that it's difficult to vent excess heat or share this bag between two people. We think the usable temperature range is also disappointingly small, extending from temps so high that you don't need a sleeping bag, down to roughly 60F.

This Patagonia bag is borderline acceptable in summer conditions...
This Patagonia bag is borderline acceptable in summer conditions, but absolutely miserable if the mercury drops.
Photo: Jack Cramer

Features


This extremely lightweight bag is understandably light on features. Although it might appear to have vertical baffles, the stitches do not continue to the inside of the bag. Instead, the synthetic matting is contained inside a baffle-less space between the shell and lining fabric. There is a small band of elastic at the collar to help seal the bag close and trap heat inside. In our tests, this elastic seemed to be inadequate--we wish there were a drawcord to close the bag more securely.

A thin strip of blue elastic attempts to seal in heat at the collar...
A thin strip of blue elastic attempts to seal in heat at the collar. We think a slim drawcord might be much more effective.
Photo: Jack Cramer

Value


Compared to many of the premium ultralight options, the Patagonia Lightweight model is available at a bargain price. Unfortunately, due to its meager warmth, we do not believe it provides a decent value. There are several other synthetic models near and below this price that offer better warmth with a similar weight. And if you consider this bag's most likely use as a liner bag inside another sleeping bag, the price seems a lot steeper.

Conclusion


It can be hard to figure out when ultralight principles get taken too far, but the Patagonia Lightweight Sleeping Bag seems to be a clear example. At just 9.8 oz for a "sleeping bag", it is an awfully tempting bargain. However, its warmth is so minimal that we struggle to classify it as a sleeping bag at all. Instead, we think this model's best use is as a liner bag for other sleeping bags or as a survival sack in an emergency.

Jack Cramer