Cumulus Lite Line 300

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The Cumulus Lite Line 300 is a functional and simply designed 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 600g.

A major asset is also the sleeping bag’s construction: Trapezoid 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. Lite Line 300 is a classic spring and summer sleeping bag, but with the use of extra insulating layers you can even use it in warm winter weather. 

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.

Cumulus clothing and sleeping bags hold the EDFA (European Down and Feather Association) certificate for ethical down sourcing

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 Mountain Equipment Firefly, although the Cumulus bag provides an extra 15g of down. 


  • 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: 600 g
  • Down weight: 300 g
  • Weight of unfilled sleeping bag: 300 g
  • Comfort temperature: 4 ˚C
  • Limit temperature: 0 ˚C
  • Extreme temperature: -15 ˚C
  • Maximum user height: 185 cm
  • Length: 202 cm
  • Width (top/bottom): 77/51 cm
  • Stuffsack’s dimensions (height/diameter): 22/16 cm
  • Stuffsack’s volume: 4.4 litre
  • Number of down chambers: 34

10 Year Warranty
Made in the E.U.

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    Marije S.
    United Kingdom

    Excellent customer service and products

    Excellent products, and brilliant customer service. I needed to exchange for another sleeping bag, and no questions were asked.