4 bivy sacks sure to keep adventurers warm and packs light

When ounces count, a quality bivy sack is sure to keep outdoor adventurers safe and warm.

Sure, you put the days of field training behind you, but there was something about sleeping out under the stars in a bivy sack that never quite left you. Tents have their place, but that one-man tent suddenly looks a bit heavy for your minimalist outdoor adventure setup. You know the areas where you’ll be spending your time, and you want to move light and fast, something that tent just won’t allow. Ditch the tent, and go for the bivy sack instead. Not only will your pack be lighter and your sleeping bag warmer, but you can also now be a little bit closer to nature, closer to the land, and closer to your ancestors. Now, you can restock your bivy sack memories with something a bit more enjoyable than that of your sergeant’s face first thing in the morning.

Finding the best bivy sack can prove challenging. Luckily, we’ve narrowed down our picks to the best four.

SnugPak Special Forces Bivvi

Best Bivy Sack

Every so often, the Brits get something right, and the SnugPak Special Forces Bivvi proves to be a much more welcome import than tea was in 1773. This lightweight bivy sack registers only 12 ounces on the scale, yet it measures a healthy 90 by 33 inches, plenty of room for sleepers of all sizes. While it may not be Gore-Tex, SnugPak’s Paratex Dry fabric still performs quite well, combining its effective waterproofing with breathability, wind resistance, and durability. This bivy sack breaks with tradition and uses a half-length center zipper for easier prep, entry, and exit than cheaper zipperless designs. Still, it leverages a familiar mummy pattern with a drawstring hood to keep things cozy. Ths Special Forces Bivvi is machine washable and includes a stuff bag which allows the entire unit to pack down into a six by four-inch rectangle capable of fitting into almost any available space. [Buy]

Outdoor Research Alpine Bivy

Best Bivy Sack

There may be quite a few bivy shelters on today’s market, but finding one better than the Outdoor Research Alpine Bivy will be quite a chore. The clamshell design and weatherproof materials combine to make this bivy the perfect choice for all but the most weight-conscious among us. This shelter consists of a 30 Denier nylon ripstop upper, 40 Denier ripstop lower with TPU lamination, and Gore-Tex, all sealed together with taped seams to provide a waterproof shelter that is waterproof, windproof, and breathable. The Alpine includes a bug mesh for more comfortable summer excursions. The zipper overhang allows for better ventilation when the rain comes, and unlike other bivy shelters, this unit uses only one pole. This 84 by 26-inch unit weighs in at less than a pound and a half (21.5 ounces), and it features two stake loops and one guy line loop for extra security. [Buy]

SOL Escape Bivvy

Best Bivy Sack

Preparation isn’t just for the Boy Scouts, and the SOL Escape Bivvy is the perfect addition to any survival kit. This bivy sack combines the best of both traditional and emergency sack designs to create the ultimate survival bivy. The familiar mummy pattern uses a quiet, tear-resistant reflective material that both resists shredding when punctured and reflects 70 percent of a user’s body heat back at them. This windproof bivy uses waterproof seams to achieve a high level of water resistance, yet it boasts a relatively breathable construction thanks to its microporous materials. The quarter-length side zipper allows for easy entry and exit while the drawstring hood helps maximize heat retention. This bivy sack weighs a mere 8.5 ounces and measures 84 by 31 inches. The Escape Bivvy may be used as a standalone shelter down to 50 degrees Fahrenheit, and unlike some emergency bivy sacks, it is entirely reusable. [Buy]

SnugPak Stratosphere Bivvi Shelter

Best Bivy Sack

Bivy shelters can get expensive, but the SnugPak Stratosphere Bivvi Shelter manages to cover the essentials (and provide an extra or two) without jacking the price. This shelter measures 91 by 32 by 20 inches, providing plenty of space inside, and measures a slightly heavy 2.5 pounds, yet it packs down to a packable 12 by six-inch rectangle. The top consists of 50 Denier nylon with a waterproof polyurethane coating while the bottom is made with 210T nylon with an 8000-millimeter waterproof rating. The entire shelter is taped and sealed, making it waterproof and windproof, and it is both breathable and well-ventilated thanks to the integrated bug netting, mesh ventilation slit, the full-length side zipper, and 190T nylon rain fly. The Stratosphere is a great choice for warm weather excursions yet can be used as a standalone shelter down to 40 degrees Fahrenheit. The shelter comes with aluminum poles with screw lock tips, tent stakes for security, and a basic repair kit (minus the vinyl repair glue). [Buy]

Related: 7 ways to upgrade your campsite

Why should you trust us

As a compulsive researcher with a fascination with survival gear, I have spent countless hours of both paid and free time learning the ins and outs and the ups and downs of various types of backcountry and emergency gear. I have spent over 25 years in and around the Rocky Mountains where bad gear can cost lives, and I am always looking for upgrades and additions to my own gear. Some of my recent reviews for Task & Purpose and The Drive include bug out bags, pocket knives, and folding saws.

The most common types of bivy sacks

Bivy sack

Short for “bivouac sack”, a bivy sack is the lightest weather-resistant sleeping shelter available on the market. These sacks look similar to mummy sleeping bags, but their function and construction give them a unique role. These sacks provide outdoor sleepers with protection against precipitation and wind while taking up an incredibly small amount of space. Unlike tents and similar structures, bivy sacks can be deployed in no time and have just enough room for a sleeping pad, a sleeping bag, a sleeper, and little else. Their minimalist design makes them incredibly lightweight and an excellent way to connect with nature.

Bivy shelter

Bivy shelters exist as a sort of hybrid between a bivy sack and a one-man tent. Like bivy sacks, these shelters are lightweight, easy to set up, and an amazing way to sleep out under the stars. They use a one or two-pole setup to keep the shelter away from the sleepers face, but most of the shelter is constructed just like a bivy shelter with the possible exception of one or two stake loops. Most bivy shelters also include integrated bug netting for a peaceful night’s sleep. These shelters are heavier than bivy sacks yet are still trail friendly.

Features to look for in a bivy sack

Water resistance

Top-tier bivy sacks provide users with a reliable, waterproof barrier between them and any precipitation that may come their way. Some bivy sacks may lack full facial protection, thus requiring the use of a tarp. However, a quality bivy sack is sure to keep sleepers dry throughout the night, assuming a properly ventilated setup.

Breathability and ventilation

Eventually, every bivy sack will collect condensation when zipped closed, so sacks made with breathable materials and a smart zipper design can be literal lifesavers. Standard issue bivy sacks use Gore-Tex to help dehumidify their interiors without permitting water entry, while some commercial vendors use less expensive materials with varying degrees of success. A properly-designed zipper system will also allow users to ventilate their bag by unzipping it some without worrying about overnight water incursion.

Protection from the elements

In addition to resisting dihydrogen monoxide (ok, water), quality bivy sacks and shelters provide protection from cold, wind, and insects. Due to their small confines, bivy sacks retain heat well, improving any sleeping bag’s temperature rating by 10 to 20 degrees Fahrenheit, and their waterproof construction easily lends itself to a windproof sack. With hood drawstrings for extra heat retention and netting to keep insects out, a bivy can become an amazing outdoor sleeping choice.

Why do you need a bivy sack?

While many people tend to see bivy sacks as emergency equipment they hope never to use, the fact is that they have some distinct advantages over tents and other traditional camping shelters. Bivy sacks and shelters are lighter weight than even the smallest of single-person tents, making them incredibly handy for high-speed low-drag adventures in the backcountry. They require less space to set up and use which means you can now check “sleep on a cliff ledge” off your bucket list, and their minimalist nature allows you to better connect with nature.

OK, so maybe rock climbing isn’t your thing, but biking cross country requires minimal gear. Both bivy sacks and bivy shelters pack small enough and light enough to stash away into a pannier bag. Bivies require minimal effort to set up, and their compact nature also makes them a great addition to any survival kit or bug out bag. While they may take a little adjusting for new users, the benefits certainly do shine through.

Pricing ranges for bivy sacks

Bivy sacks can be an incredibly handy shelter to have on hand in the backcountry, in the back seat, or in your bug out bag. While they may be less expensive than a tent, they are more than just a glorified sleeping bag, so be prepared to pay accordingly. As a rule of thumb, bivy sacks under $75 fall into the emergency gear category, although some traditional options do exist minus some key features, such as breathability. Emergency bivy sacks consist of Mylar panels fused together into a single unit. They are far from the most breathable sacks you’ll encounter, and they lack many of the common essential features of a traditional bivy sack.

Quality bivy sacks and bivy shelters usually get tagged at $75 or more and often over $100. They are heavier than emergency Mylar designs but certainly won’t feel anything like a brick in your pack. These bivy sacks include the traditional features you’ve come to know and love and are much more comfortable than Mylar sacks.

How we chose our top picks

When reviewing new gear, we much prefer to go the hands-on route, but sometimes, a lack of resources may thwart our attempts to get our mitts on some cool gear. When that happens, we listen to those who have firsthand experience. We comb through online reviews on Amazon, enthusiast blogs, professional publications, and more to bring you the best, most comprehensive information we can. We sift through it all, keeping the gold and tossing the rest. For this review on bivy sacks, we especially appreciated input from REI and MSR Gear.

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Brian Smyth

Brian SmythFor over 25 years, Brian has been neighbors with the Air Force Academy and the U.S. Army’s Ivy Division. He loves the challenge of crafting words and has written for The/Drive, Car Bibles, and other publications. Nothing gets him going quite like the roar of dual Pratt & Whitneys overhead, the smell of cordite, and the stories of the Greatest Generation. Contact the author here.