Cumulus Lite Line 400

1   |  
Zip Side

The Cumulus Lite Line 400 is a functional and simply designed best selling down sleeping bag, perfect for spring and summer camping. 

Bringing functionality and simplicity together in seamless fashion this sleeping bag will suit lightweight end uses where warmth-to-weight is paramount, such as mountain marathons, lightweight summer backpacking, cycle touring etc. This latest version is made using ultra-light (29 g/m2) Pertex Quantum fabric, so the total weight of the sleeping bag is just 705g.

A major asset is also the sleeping bag’s construction: “H” chambers, a shark-fin foot box and the ergonomic design of the hood providing unique levels of comfort. Additionally, draw cords and tapes to the hood make it more adjustable. It’s no surprise that the Lite Line 400 is a best-seller being an excellent product for camping from early spring to late autumn. 

Who are Cumulus?

Designed and built in Poland, Cumulus draw on 30 years of experience and know-how in down and textile manufacture to provide some of THE best sleeping bags on the market. At the vanguard of sleeping bag construction techniques and design innovation, Cumulus offer as many as five methods of chamber construction, each developed to offer its own unique benefits [Cumulus Down Sleeping Bag Construction article]. All bags use sustainably sourced Polish goose or duck down, high-grade face and liner fabrics from Pertex, YKK zippers and, unlike most other sleeping bag brands, are entirely constructed in the EU.

Advice on Temperature Ratings

Temperature ratings are used to indicate a bags performance and help you decide between models. However, they are subjective and can be greatly affected by factors such as what you're happy to wear (clothing wise) in conjunction with the bag, your health and metabolism, how much you have had to eat or drink, humidity and altitude, the type of shelter used and whether you are using a suitable insulating mat.

As a guide, the "Comfort" rating indicates the range at which a woman gets a comfortable night’s sleep, the "Limit of Comfort" rating indicates the range at which a man gets a comfortable night’s sleep and the "Extreme" rating indicates a range at which a woman is protected from hypothermia. The Extreme rating is basically a survival rating and it is not advisable to rely on this for general use.

More Help? For further assistance on choosing your down sleeping bag, please view this article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.

Model Comparison
A comparison bag more widely available in the UK would be the Rab Neutrino 400, although the Cumulus bag is quite a bit lighter. 


  • Fabric: Pertex Quantum DWR, 29 g/m²
  • Filling: Polish goose down, 850 cuin
  • Construction: Trapezoid
  • Independently filled top and bottom of the sleeping bag
  • Shark-fin foot box
  • 175 cm YKK separating zip with two self-locking sliders
  • Can be opened and ventilated at the bottom of the sleeping bag
  • Can be combined with other sleeping bags
  • Full length, down-filled, zip insulating baffle
  • Independent down-filled collar
  • 3D, adjustable hood with a draw cord, a lock and a tape
  • Mesh pocket with a zip inside the sleeping bag, a fluorescent puller
  • Three external eyes on the longer side of the sleeping bag used for drying it
  • Two eyes to hang the sleeping bag
  • Additional, large mesh bag to store your sleeping bag at home


  • Total weight: 705 g
  • Down weight: 400 g
  • Weight of unfilled sleeping bag: 305 g
  • Comfort temperature: 2 ˚C
  • Limit temperature: -40 ˚C
  • Extreme temperature: -20 ˚C
  • Maximum user height: 185 cm
  • Length: 202 cm
  • Width (top/bottom): 77/51 cm
  • Stuffsack’s dimensions (height/diameter): 25/17 cm
  • Stuffsack’s volume: 5.7 litre
  • Number of down chambers: 34

10 Year Warranty
Made in the E.U.

    Customer Reviews

    5 Based on 1 reviews
    5 Star
    4 Star
    3 Star
    2 Star
    1 Star
    Write a Review Ask a Question
    • Reviews
    • Questions

    Thank you for submitting a review!

    Your input is very much appreciated. Share it with your friends so they can enjoy it too!

    • space
    • choice
    • sleeping
    • 2374m
    • Cumulus Lite Line
    • NE India
    • Eaglenest Lama Camp
    • luggage
    Vivienne B.
    United Kingdom

    Cumulus Lite Line

    I was lovely and warm sleeping in the Cumulus Lite Line at 2374m at Eaglenest Lama Camp in NE India. It packed down small so didn't take much space in my luggage and was really light. An excellent choice.


    Don't Miss The Next Big Deal!