Lightweight summer sleeping bags for trekking, bikepacking and camping
Warm days, cool nights, and damp mornings: A good outdoor summer sleeping bag should be lightweight and pack down small, while still being suitable for the intended temperature range and use. The DownWool® 2.0 summer sleeping bags from Grüezi bag® combine down and wool and, depending on the model, are suitable for trekking, bikepacking, camping, van life, hut-to-hut tours, and travel.
The down provides warmth while remaining lightweight and compact. The wool absorbs moisture, promoting a pleasantly dry and balanced sleeping environment. This is especially helpful in changing temperatures, high humidity, and condensation inside the tent.
Which summer sleeping bag is right for you?
You can choose between four models: the ultra-light Extreme Light , the lightweight Summer Light , the warmer Summer , and the spacious Summer Comfort.
| Model | Ideal for | Limit temperature | Weight Regular | Peculiarity |
|---|---|---|---|---|
| DownWool® 2.0 Extreme Light | Bikepacking, trekking, hut-to-hut tours and summer trips | 8 ° C | from approx. 450 g | Minimal weight and particularly small pack size |
| DownWool® 2.0 Summer Light | Bikepacking, trekking, hut-to-hut tours and trips with more reserves | 2 ° C | from approx. 700 g | Lightweight and compact with additional heat reserve |
| DownWool® 2.0 Summer | Trekking, bikepacking, camping and cooler nights | -3 ° C | from approx. 750 g | More heat reserve at a low weight |
| DownWool® 2.0 Summer Comfort | Camping, van life, travel and comfort-conscious sleepers | 2 ° C | approx. 950 g | Plenty of freedom of movement and can be used as a blanket |
The temperatures mentioned are the limit temperatures determined according to EN ISO 23537-1. They serve to allow for the technical comparison of sleeping bags. The comfort temperature and our recommendation for optimal use can be found on the respective product page.
A comparison of the four summer sleeping bags
DownWool® 2.0 Extreme Light - when every gram counts
The DownWool® 2.0 Extreme Light is designed for warm summer nights and tours where minimal weight and an exceptionally small pack size are crucial. Weighing from approximately 450 g, it can be compactly stowed in a backpack or bikepacking bag.
Despite its ultralight construction, the comfortable cut offers more freedom of movement than many very narrow-fitting ultralight sleeping bags. The Extreme Light is particularly suitable for bikepacking, trekking, hut-to-hut tours, pilgrimages, and overnight stays in mild temperatures.
The Extreme Light is the right choice if you:
- if you are out and about in warm summer temperatures,
- if you want to carry as little weight as possible.
- requires a particularly small packing size,
- you still value freedom of movement.
Limit temperature: 8 ° C
Weight Regular: from approx. 450 g plus stuff sack
DownWool® 2.0 Summer Light - lightweight with extra reserve
The DownWool® 2.0 Summer Light is the right choice for anyone who wants to travel light but desires more warmth than the Extreme Light offers. It is suitable for bikepacking, trekking, hut-to-hut tours, camping, and travel from late spring to early autumn.
Its light weight and compact size make it easy to transport. At the same time, the comfortable cut offers sufficient freedom of movement for restful nights – even for sleepers who toss and turn frequently during the night.
The Summer Light is the right choice if you:
- If you want to travel light and compactly
- You need more heat reserve than with the Extreme Light,
- when you spend the night outdoors while trekking or bikepacking
- You are looking for a lightweight sleeping bag with a comfortable cut.
Limit temperature: 2 ° C
Weight Regular: from approx. 700 g plus stuff sack
DownWool® 2.0 Summer - more heat reserve for cooler nights
The DownWool® 2.0 Summer is ideal for anyone looking for a lightweight and compact sleeping bag, but who needs extra warmth for cooler nights and changeable conditions. It's a versatile companion for trekking, bikepacking, camping, and tours from spring to autumn.
Compared to the Summer Light, the Summer offers more warmth without being too heavy or bulky. This makes it suitable for tours where nighttime temperatures are not always reliably predictable.
The Summer is the right choice if you:
- even if you sleep outside on cooler nights,
- If you are looking for a versatile sleeping bag for multiple seasons,
- If you want to combine heat reserve and low weight,
- If you want to remain flexible while trekking, bikepacking or camping.
Limit temperature: -3 ° C
Weight Regular: from approx. 750 g plus stuff sack
DownWool® 2.0 Summer Comfort - plenty of space and freedom of movement
The DownWool® 2.0 Summer Comfort is ideal for anyone who feels confined in a mummy sleeping bag. Its rectangular shape offers plenty of room to turn over and is particularly suitable for camping, van life, travel, and side sleepers.
On warm nights, the sleeping bag can be fully opened and used as a blanket. This combines the sleeping climate of DownWool® 2.0 insulation with the comfort and flexibility of a rectangular sleeping bag.
The Summer Comfort is the right choice if you:
- especially if you want a lot of freedom of movement
- you quickly feel confined in a mummy sleeping bag,
- especially when camping or spending the night in a van
- if you want to use the sleeping bag as a blanket as well.
Limit temperature: 2 ° C
Weight approx. 950 g plus stuff sack
What is special about DownWool® 2.0?
DownWool® 2.0 combines 70% down with 30% wool . The two materials perform different functions and complement each other within the insulation.
Down provides warmth at a low weight
Down provides excellent warmth while remaining lightweight and compact. This allows the sleeping bags to be packed down small and easily transported on trips.
Wool for a balanced sleeping climate
The body releases moisture while sleeping. Additionally, condensation can form inside a tent or under a tarp. Wool can absorb moisture, thus promoting a pleasantly dry and balanced sleeping environment.
Advantages of DownWool® 2.0 insulation
- lightweight and small pack size,
- pleasant sleeping environment under changing conditions,
- Moisture management through the wool content,
- Comfortable cut with freedom of movement.
Learn more about DownWool® 2.0 insulation
What does the specified limit temperature mean?
The temperature mentioned in the product title is the limit temperature T lim according to EN ISO 23537-1. This value is primarily used to compare different sleeping bags on a uniform technical basis.
Limit temperature and personal comfort zone
The limit temperature is not automatically the temperature at which everyone sleeps comfortably and restfully. Personal comfort levels are usually higher and depend on individual sensitivity to cold as well as the conditions during the night. We recommend using the comfort setting as a guide.
These factors influence your perception of heat
- individual sensitivity to cold and physical condition,
- Quality and insulation performance of the sleeping mat,
- Clothing and sleeping mat,
- Wind, humidity and ground conditions,
- Nutrition, exhaustion, and daily condition.
Therefore, on each product page you will also find the comfort temperature as well as an easy-to-understand recommendation for the optimal temperature and application range.
Comfort and limit temperatures explained in an easy-to-understand way
Finding the right sleeping bag size
A sleeping bag should be neither too short nor unnecessarily large. If a sleeping bag is too short or too tight, the insulation in the head, foot, or side areas can be compressed, creating cold spots.
Extreme Light, Summer Light, and Summer are therefore available in different lengths. Choose the size that suits your height and desired level of freedom of movement.
Weight or additional freedom of movement?
If you want to keep the weight as low as possible, choose the size that fits your height. If you prefer more space in your sleeping bag, the next larger size might be more comfortable, depending on your height.
Finding the right sleeping bag size
Frequently asked questions about summer sleeping bags
Extreme Light, Summer Light or Summer - which one is right for me?
Choose the Extreme Light if minimal weight and a particularly small pack size are paramount and you'll be traveling in mild summer temperatures. The Summer Light offers more warmth while remaining lightweight. The Summer is the right choice for cooler nights and changeable conditions.
For which season are summer sleeping bags suitable?
The Extreme Light is designed for warm summer nights. The Summer Light is particularly suitable for tours from late spring to early autumn. The warmer Summer offers additional warmth and, depending on the weather, sleeping location, sleeping mat, and personal sensitivity to cold, can also be used in spring and autumn.
Mummy sleeping bag or blanket sleeping bag?
A mummy sleeping bag is cut close to the body and is therefore usually lighter and more efficient to warm. A rectangular sleeping bag offers more freedom of movement and can be opened and used as a blanket. Extreme Light, Summer Light, or Summer models are often suitable for trekking and bikepacking. For camping and van life, the Summer Comfort offers particularly ample space.
Why is the right sleeping mat important?
Underneath the body, the filling of the sleeping bag is compressed and can only provide limited insulation. A sleeping mat suitable for the temperature is therefore crucial to reduce heat loss to the ground.
Can I get advice on making my selection?
Yes. Besides temperature, body size, sensitivity to cold, sleeping location, sleeping mat, and the intended use all play an important role. Our team will be happy to help you find the right sleeping bag for your trip.
Still unsure? Discover our sleeping bag overview and compare other models based on temperature, shape, and intended use.
