Colin Snow
Bivy bags are a great option for outdoor enthusiasts looking to keep their gear lightweight and compact. They are essentially a waterproof cover for your sleeping bag, protecting you from the elements while providing more room for your upper body and keeping the bag material from collapsing onto your face. When considering how to use a bivy with a sleep system, it's important to ensure that your setup provides adequate ventilation to reduce condensation and improve airflow. This can be achieved by using breathable fabrics, such as Gore-Tex, and avoiding complete head enclosure by leaving a small opening for air circulation. Bivies are popular in mountaineering and can be combined with other gear, such as a tarp or mosquito net, to create a more complete shelter system. It's worth noting that while bivies offer a liberating experience similar to sleeping under the stars, they may not be suitable for those who feel uncomfortable in tight spaces.
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What You'll Learn
Choosing the right bivy bag
Bivy bags are a great alternative to tents for backpackers and hikers who want to keep their gear as light as possible. They are also useful for emergency situations, such as when you get lost or injured on a trail. When choosing the right bivy bag, consider the following:
Size and Weight
The size and weight of your bivy bag will impact its portability and comfort. Look for bivy bags that are lightweight and compact, but also spacious enough to accommodate your body size and sleeping gear. A larger bivy bag might be more comfortable, but it will also be heavier and more difficult to carry.
Ventilation
Condensation can be a factor with bivy bags, so it's important to look for options with ample ventilation to reduce condensation and improve airflow. Some bivy bags have a clamshell opening and mesh bug screen to allow for ventilation during a rainstorm or nicer weather. If your bivy can be staked out or has a pole, you can create extra airspace between your body and the bivy walls, improving ventilation.
Features
Consider what features are important to you in a bivy bag. Some bivy bags have bug netting, pockets for storing gear, and easy-to-use zippers. If you plan to use your bivy bag in cold weather, look for one with good insulation. If you're concerned about privacy or protection from the sun, you might want a bivy bag with a full-length zipper that can be closed for more coverage.
Weather Conditions
Consider the weather and climate you'll be camping in. A bivy bag suitable for mild weather might not be appropriate for cold, snowy nights. Look for features like waterproofing, breathable fabrics, and insulation to ensure you'll be comfortable and protected from the elements. If you're camping in an area with variable temperatures, consider bringing a synthetic sleeping bag that will retain its insulating properties if it gets damp or soaked.
Durability and Affordability
Bivy bags range in price, so you can find one that fits your budget. The durability and longevity of bivy bags make them a worthwhile investment for those who enjoy outdoor activities regularly. Some bivy bags are made with reflective materials, which can be helpful in emergency situations as they can help rescuers locate you.
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Sleeping bag and insulation
Sleeping bags and insulation are key components of a bivy system. A bivy, short for "bivouac", was invented to provide climbers with lightweight emergency weather protection for their sleeping bags during multi-day trips. A traditional bivy sack has two primary functions: it keeps a sleeping bag dry and increases its warmth capacity by about 10°F.
When choosing a sleeping bag, consider the weather and climate you'll be camping in. If you're venturing into a cold, dry climate, you might need a bag rated for colder conditions. In warm conditions, some people forgo the sleeping bag and sleep directly inside the bivy shell. If you plan to camp in variable temperatures, a synthetic sleeping bag is a good option as it retains its insulating properties even when damp or soaked.
To enhance insulation, consider using a sleeping pad. A pad provides cushioning for a more comfortable sleep and insulates you from the cold ground. A foam pad works well for most situations, but for colder weather, an air pad or insulated pad is recommended.
Proper ventilation is crucial when using a bivy with a sleeping bag. It prevents condensation inside the bivy and minimises the clammy feeling that can occur with certain fabrics, like Gore-Tex. Bivies with multiple zipper sliders allow for armholes and ventilation options. If your bivy has stake-out points or a pole, take advantage of these features to create extra airspace between your body and the bivy walls, improving ventilation.
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Ventilation and condensation
To minimise condensation, it is recommended to use a bivy with adequate ventilation. Look for bivy bags with features such as a breathable membrane, a mesh layer, or bug netting to allow for air circulation and prevent condensation buildup. A larger bivy bag can also provide more breathing room, but keep in mind that it may be heavier and more difficult to carry.
In rainy or snowy conditions, consider using a double-walled bivy bag or a tarp to provide extra protection from the elements. A tarp can be pitched above the bivy bag to shield it from direct precipitation, reducing the amount of moisture that accumulates inside. Additionally, leaving your bivy sack partially unzipped can help improve air circulation and reduce condensation.
If you're using a sleeping bag inside the bivy, choose one made of synthetic material as it retains its insulative powers even with moisture buildup. You can also use a Vapor Barrier Liner (VBL) clothing or sack inside your sleeping bag to reduce the amount of water vapour released into the insulation.
It's important to note that complete head enclosure in a bivy sack is not recommended. Always follow the instructions provided by the manufacturer to ensure safe use. Additionally, consider the colour of your bivy, as darker colours tend to radiate more heat and condense more than lighter colours.
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Tarps and other accessories
Tarps as a Weather Barrier: Tarps serve as a critical barrier against precipitation and condensation. When setting up your bivy, ensure that the tarp extends beyond the bivy's edges to maximise coverage. This setup will prevent rainwater from dripping onto the bivy and minimise condensation buildup inside. It's also a good idea to angle the tarp slightly away from the bivy to facilitate better water runoff.
Tarp Materials and Features: Opt for tarps made from durable, waterproof, or water-resistant materials. Some tarps are designed with breathable fabrics, allowing vapour from body heat to escape while still providing protection from rain and dew. Consider tarps with reflective materials, especially if you plan to venture into remote areas. This feature can help rescuers locate you in an emergency.
Tarp Setup and Flexibility: Practice setting up your tarp efficiently, as you may need to pitch it quickly in changing weather conditions. Familiarise yourself with different tarp configurations to suit various environments and weather scenarios. For example, you might use a poncho tarp, which can double as rain gear, or a tarp with a built-in bug net to protect against insects.
Sleeping Mats and Pads: Sleeping mats or pads are crucial for comfort and insulation. They provide a layer of cushioning, ensuring you sleep on uneven or lumpy terrain. Look for mats or pads with higher R-values, as these offer better insulation, keeping you warmer during cold nights. You can place the sleeping mat inside or outside the bivy, depending on your preference for protection or comfort.
Sleeping Bags and Quilts: Sleeping bags are essential for warmth, and you can enhance this effect by adding a sleeping bag liner. Quilts are also a popular option, especially with bivy systems, as they can be more comfortable and flexible. Consider the temperature ratings of your sleeping bag or quilt to ensure they are suitable for the conditions you'll be camping in.
Ventilation and Condensation Management: Proper ventilation is critical to maintaining a comfortable sleeping environment and reducing condensation. Look for bivy bags with ample ventilation features, such as breathable fabrics, mesh layers, and easily adjustable zippers or flaps. Manually venting zippers can help regulate humidity levels inside the bivy. Additionally, leaving a small opening in your bivy bag can allow fresh air to circulate while you sleep.
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Safety considerations
When using a bivy with a sleep system, there are several safety considerations to keep in mind.
Firstly, it is important to choose the right bivy for your needs. Consider the terrain and activities you'll be engaging in. If you plan on hiking long distances, opt for a lightweight and compact bivy that won't weigh you down. If you're camping in rocky or uneven terrain, look for a bivy with sturdy poles for more stability. Ensure your bivy has ample ventilation to reduce condensation and improve airflow. Check for features like bug netting, pockets for gear storage, and easy-to-use zippers.
Secondly, always be mindful of the weather conditions. While bivies are popular in mountaineering, they may not offer complete protection from harsh weather. In heavy rain or snow, condensation can build up inside the bivy, leading to a wet sleeping bag. This can be dangerous if you're unable to dry your gear and spend another night outdoors. Consider using a tarp or poncho tarp for additional protection from the elements.
Additionally, be cautious when fully zipping up your bivy. Some manufacturers advise against complete head enclosure due to potential risks associated with carbon dioxide buildup and reduced oxygen levels. Always follow the instructions provided with your bivy and prioritize ventilation to maintain a safe breathing environment.
Finally, practice setting up your bivy beforehand. Familiarize yourself with the zippers and ventilation options. Know how to quickly access your gear and adjust the bivy in changing weather conditions. Always carry essential items like a first aid kit, and consider including a bivy in your survival kit for emergency situations.
By following these safety considerations, you can confidently use a bivy with your sleep system and enjoy your outdoor adventures.
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Frequently asked questions
Bivies are lightweight, compact, and versatile. They are designed to protect you from the elements while sleeping outdoors. They are also useful in emergency situations, providing quick and easy shelter.
Consider the size and weight of your bivy bag. It should be lightweight and compact, but also spacious enough to accommodate your body size and sleeping gear. Look for features such as ample ventilation to reduce condensation, bug netting, pockets for storage, and easy-to-use zippers.
When using a bivy with a sleep system, some people choose to keep their sleeping mat inside the bag, while others prefer to keep it outside for added protection. You can also use a tarp or mosquito net with your bivy to create a more complete shelter system.
