Zpack’s Classic Sleeping Bag is an ultralight hoodless sleeping bag with a 3/4 length zipper that weighs between 17 oz and 21.6 oz in the 20-degree model, depending on sizing. The zipper means you can also open it up like a quilt or blanket in warm weather when less insulation is needed. Hoodless sleeping bags, especially ones this lightweight are a great alternative for backpackers and campers who don’t like the confines of a mummy hood. They can also eliminate the risk of cold drafts because they can be zipped up completely, which can be a problem with quilts, particularly in colder temperatures.
Specs at a Glance
- Temperature rating: We tested a 20-degree bag. Also available in 10-degree and 30-degree models
- Insulation: 950 fill power goose down, Downtek water-repellent treated, RDS-certified
- Size Tested: Standard width, Medium length
- Weight: 19.6 oz in a 20 degree, in a standard-width (60″), medium-length (72″) size
- Fill Weight: 13.7 oz
- Girth: 60″/60″/40″ (Shoulders/hip/feet)
- Packed volume: 6 liters
- Zipper: 3/4 length
- Shell and liner: 7d Ventum Ripstop Nylon w/ DWR
- For complete specs and sizing options, visit the Zpacks Classic Sleeping Bag product page
What’s better, a quilt or a sleeping bag for sleeping in 20-degree weather? That’s really a matter of personal preference. Some people prefer a hooded mummy bad when it gets colder, while others like a quilt. Personally, I like to split the difference and use a hoodless sleeping bag, augmented with an insulated hat or down hoodie because I’m a side sleeper and roll around at night. A mummy bag is too confining for my head and upper body, while a quilt is too drafty when temperatures drop to 20 degrees or less.
The Zpacks Classic Sleeping Bag is a sophisticated sleeping bag that’s been optimized to save weight. I knew it would be lightweight because I’ve been using Zpacks’ gear for 10 years, but I wasn’t expecting such as nuanced and refined design.
Here are a few highlights of note:
- The bag is insulated with 950 fill power goose down which is very top-shelf and overstuffed by 30% to ensure warmth for people who sleep cold.
- The baffle construction is NOT sewn-through but boxed, eliminating cold spots along the seams. This becomes more important on bags and quilts rated for 30 degrees or colder.
- The vertical baffles on top of the bag prevent goose down from dropping down the sides, keeping the down where you want it, which is on top for maximum warmth.
- The zipper does NOT have a draft tube to seal out cold drafts because it’s assumed you’ll be lying on top of it.
- The top of the zipper is reinforced with a buckle to keep it closed at night and to release stress on the zipper assembly.
- The Classic is made with a thin windproof 7 denier shell and liner to keep it lightweight.
- While tapered, the footbox is large enough so you can position your feet in any position.
- The Classic is available in several widths and lengths to accommodate individual differences. You don’t get this degree of choice with most mass-market bought sleeping bags.
The nice thing about the Zpacks Classic is that it can be completely zipped up like a sleeping bag in cool weather or unzipped and used as a quilt/blanket when it’s warmer. Getting into the bag when it’s fully zipped requires scooching into it as you pull it up over your shoulders, but it’s really not difficult to do. While the zipper is designed to be laid on, under your back, you can rotate the bag so it’s on top or along your side and vent it from there, providing good versatility across a wide range of temperatures.
But there’s a catch if you’re a side sleeper. The Classic has a drawstring to cinch the bag closed around your neck and seal in the heat. The drawstring is positioned in the center of the bag over your chest, but can’t be reached easily unless you lie on the zipper on your back. This is sub-optimal if you’re a side or stomach sleeper because it can become difficult to adjust the drawstring tension once you’ve zipped the bag closed. Hoodless bags and quilts with side collar controls are much easier to use for side sleepers for this reason.
It also means that heat will be lost and cold drafts will enter the zipper if you roll over and expose it to cold air because it is not protected by an insulated draft tube to prevent heat loss. Zippers leak heat and if you look at the Classic zipper closely, you’ll see lots of light showing through the needle holes in the fabric that holds it in place. Hoodless bags with zipper drafts tubes or zipperless bags are better for side sleepers in cooler temperatures. The Zpacks Full Zip Sleeping Bag, which is virtually identical to the Classic, does have a zipper draft tube and is a better option for side sleepers. With the Full Zip, you can roll onto your side or stomach without experiencing zipper heat leakage, and still easily adjust the top drawstring.
Comparable Hoodless Sleeping Bags
|Make / Model||Footbox||Zipper||Draft Tube||Collar Controls|
|Enlightened Equipment Conundrum Sleeping Bag||Closed||3/4||Yes||Center|
|Enlightened Equipment Convert Sleeping Bag||Drawstring||Full||Yes||Center|
|Feather Friends Flicker 20 UL 20 Quilt Sleeping Bag||Drawstring||Full||Yes||Sides|
|Feathered Friends Tanager 20 CFL Sleeping Bag||Closed||None||NA||Center|
|Nunatak 3D Quilt||Closed||3/4||Sides|
|Zpacks Classic Sleeping Bag||Closed||3/4||No||Center|
|Zpacks Full Zip Sleeping Bag||Closed||Full||Yes||Center|
The Zpacks Classic Sleeping Bag is a great option if you’re a back sleeper and prefer using a hoodless zippered sleeping bag in cooler weather because it’s less prone to cold drafts than a quilt. The sleeping bag is well-designed, made with high-grade materials, and is available in a wide range of widths and lengths for every body type and length. However, if you’re a side or stomach sleeper, we’d recommend getting the Zpacks Full Zip Sleeping Bag instead, because it has an insulated draft tube to the cover the zipper. This means that you can roll over without experiencing drafts through the zipper, while still keeping the center collar control positioned within easy reach over your chest
Disclosure: Zpacks provided the author with a sleeping bag for this review, but the opinions expressed are my own.Editor's note: Help support this site by making your next gear purchase through one of the links above. Click a link, buy what you need, and the seller will contribute a portion of the purchase price to support SectionHiker's unsponsored gear reviews, articles, and hiking guides.
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