The Zpacks Classic is a hoodless mummy bag that also opens up into an enclosed foot box style quilt. While it is awesome enough to be the second highest rated bag in our test, it also has a number of drawbacks, including a more restrictive fit than some other bags, and slightly less than awesome functionality out of its features. This sleeping bag is made by a small independent manufacturer that makes all products to order and is thus supremely customizable (for a price, of course). While we tested a 20F Standard girth bag, they are also available in 10F, 30F, and 40F and in slim and broad girths. An additional feature that can also be added on is a zipper draft tube. We tested this bag during many nights spent sleeping in guesthouses, in homestays, in a tent, and outside while trekking in the Khumbu region of Nepal in the early spring month of March.
How to Get It:
All Zpacks products are custom-made in Florida. They are only available for purchase through their online store: ZPacks.com
A solo campsite up in a side valley of the Khumbu, the famous part of the Himalaya that is home to Mt. Everest. The 20 Degree by ZPacks kept us nice and warm on what proved to be a chilly night.
Stuffed with 13.1 ounces of light and fluffy 900 fill power down, this is indeed a warm bag. When looking at how well it lofts up in comparison to other bags we tested, it is puffier than most. Also contributing to its warmth is vertical box baffle construction around the torso and upper legs, and horizontal box baffles around the feet. Insulation sewn into box baffles means that there are no points where the material on the outer and inner parts of the bag meet, creating down "dead spots," where there is effectively zero insulation. With its high rating and thoughtful and quality sewing work, this was one of the warmest bags in our test.
Showing the high lofting 900 fill power down of the green Zpacks sleeping bag, and how much more fluffs up naturally than the heavier and lower fill power Backcountry Quilt 700.
However, there were a few things that stuck out to us as we tested this bag well below freezing, and once while being snowed on, in Nepal. The first is that there is no draft tube that covers the zipper, as there is on the Patagonia 850 Down Sleeping Bag 30, although Zpacks claims this is no big deal since you should be sleeping on top of the zipper (they will also add one to your bag for $20). We also found that without a hood, the collar needs to be drawn really tight to keep warm air from escaping, and the very thin bungee cord that accomplishes this was not the most ideal for this purpose. A heavier duty cord like that found on the Feathered Friends Flicker 40 UL worked much better. The end result was that this bag was quite warm.
This bag is highly lofted and has great box baffle construction, and combined with its 3/4 length zipper, makes for a versatile option that can handle warm and cold nights.
At 20.3 ounces (1 lb. 4.3 oz.) our Standard Long bag weighed in slightly heavier than Zpacks claimed, although the difference was negligible. The waterproof cuben fiber rolltop stuff sack, without doubt the highest quality stuff sack to come with a sleeping bag that we have found, weighed an extra 0.9 ounces. Compared to the competition, this bag was merely average when it came to weight, although was still super light given how warm it is.
The cuben fiber roll-top waterproof stuff sack that came included with the 20 Degree was a real hit, and was, without a doubt, the best stuff sack we used during this review. Zpacks also sells these sacks on their own, and we would recommend one for all sleeping bags.
For the sake of reference, we will let you know that this hoodless mummy was very close to the same weight as our Best Overall Award winning Feathered Friends Flicker 40 UL, another hoodless mummy design, even though it is rated 20 degrees warmer. The Feathered Friends Vireo UL was the lightest hoodless mummy, weighing in about four ounces lighter than the Zpacks, but it notably does not have a zipper of any sort.
The most important aspect when assessing for comfort was the fit of the bag. Despite the fact that we bought a "long" bag good for people 5'10", and our head tester is 5'11", we found that this bag was long enough and easily covered the tops of our shoulders. That said, the foot box was fairly small, and the fit overall was a bit constricting. Since it doesn't have a hood, on cold nights a hat is mandatory, but we were often more comfortable wearing a jacket with a hood, even though it meant filling even more of the valuable space inside.
This Zpacks 20 Degree hoodless mummy bag was just long enough to comfortably wrap around our shoulders and cinch tight around our neck, for a pretty much perfectly comfortable fit.
One minor complaint we had when it came to comfort was that the neck drawcord, when fully tightened around our neck to keep the heat in, was excessively long and dangled around, often getting wrapped up around our neck as we moved about in our sleep. This was in stark contrast to the design of the Patagonia 850 Down Sleeping Bag 30, which used dual drawcords that lived outside of the bag, so they didn't get in the way.
When considering how versatile a sleeping bag is we like to consider how easily it can be used in all different temperatures, climates, and seasons. As a warm bag that can be zipped all the way up into a mummy, this bag is for sure appropriate for those colder shoulder seasons — spring and fall — or during rogue storms. In Nepal, we were camped out in early March in this bag when a surprise downpour hit us, which soon turned into an all-night snowstorm. Suffice to say it was cold and the inside of our tent was completely soaked, but the DWR coating on both the inside and outside of this bag held up, retaining its loft, and our comfort. With the ability to open up most of the way and use it as an enclosed foot box-style quilt, this bag also does a plenty adequate job of ventilating on warmer nights.
The neck buckle was a nice feature that allows for keeping the sleeping bag tight around the neck even when the zipper is unzipped for a more relaxed fit on nights when it isn't frigid.
With the ability to use it during all seasons, we graded this bag as one of the highest when it came to versatility. Only the Feathered Friends Flicker 40 UL scored higher, mostly because it could be opened into a full blanket and shared with two people.
We can honestly say that if Zpacks chose to employ slightly higher quality features, this would be far and away the best ultralight sleeping bag in this review. Particularly annoying to us was the very thin, lightweight, stretchy bungee cord used as the neck drawcord. Ours did not even have a buckle to cinch the cord tight, and after using it one night by trying to tie knots to keep it tight, we eventually had to pirate a buckle off of another stuff sack. The bungee cord is also not an ideal choice, as it requires pulling the cord super tight to keep it snug around your neck, and leaves a very long dangling end near your face.
The elastic draw cord around the neck of this bag, showing how it came to us, with no buckle to keep it tight! We also found that elastic is not the best cord for this purpose, as it stretches looser when all you want is a tight seal around the neck.
We also found that the zipper was prone to catching on the inside of the nearest baffle fabric, and thought this could have been fixed with a draft tube made with some tougher material like was found on the Flicker 40 UL. While we didn't test this bag to failure, we surmise that one of these two features will be the first fail point in this otherwise well-constructed sleeping bag. Even considering the super awesome roll-top, waterproof, cube fiber stuff sack that is included with your purchase, we couldn't give the features on this bag nearly as high a score as some other products.
We had to pirate a buckle off of another piece of gear, and rig it up for usage. This poorly executed feature was one of the only complaints we could find with this otherwise excellent sleeping bag.
As a genuinely three-season ultralight sleeping bag, there are few camping applications where this bag will not shine. We think it makes a good choice as a down insulated bag in wet climates, and with its superior versatility is ideal for thru-hikers, or any sort of backpacking for that matter. Those that sleep warm or cold have the option of choosing more or less insulation.
When our lead tester was putting together a sub-15-pound pack (total weight with food) for a two-night mountain traverse with rough bivies, the exceptional warmth-to-weight ratio of the ZPacks 20 made it his top choice.
The version of this bag that we tested, the 20F Standard Long, will run you $379 retail. Since you can only order this bag from the manufacturer, it's unlikely that you will end up finding a discount deal online somewhere. At this price, it is on the upper end of the price spectrum for ultralight bags we tested. Since we consider it to be one of the best ones available, we think it presents a pretty good value. We would be slightly happier to pay this price if the draft tube came included and the neck drawcord was beefier, but even so, we think this is a bag worth spending the money on.
The Zpacks Classic is the second highest rated bag in our review for the second year in a row, packing a surprising amount of insulation and warmth into a relatively light package. We used it during high altitude treks and even snowstorms in the Himalaya and found it to pretty true to its temperature rating. While we have a few complaints about the components used as its principal features, we still think it is one of the most versatile ultralight bags available on the market today and is one we would love to own personally.
Happy to find a villager in the middle of nowhere, Rolwaling Valley, Nepal, who was willing to let us set up overnight in his yard when it was discovered the local tea house had not been rebuilt after the earthquake. Moments later an all night rain and snow downpour commenced.