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Mammut Jura 3-4 Season Sleeping Bag

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Retail Price £140.00

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A sleeping bag that uses Ajungilak® Comfort Technology for comfort in the cold.

The Mammut Jura Sleeping Bag is a low weight, high performance bag that uses Ajungilak® Comfort Technology for a great warmth to weight ratio.

Its MTI™ 13 two layer filling, made in-house by Mammut, combines low weight, compressibility and maximum insulation.

It's built tough to last for repeated use season after season, and comes with a compressible water resistant stuff sack letting you keep it dry and packed to a tiny size when you're not using it.

  • Seamless construction avoids the formation of cold spots, improving insulation all round (see guide here )
  • MTI™ 13 two layer filling combines low weight, compressibility and maximum insulation
  • Performance TX™ outer fabric is an extremely compressible, high-performance Nylon Ripstop fabric that is lightweight, strongly water-repellent and very rugged
  • SoftTX™ inner fabric . “Skin-friendly” silky cotton feel, very robust and breathable
  • Ergonomic foot gives you extra comfort (see guide here )
  • Supplied with high quality, water-resistant compression sack
  • Travel game on the lid of the compression sack
  • 2-way ¾ YKK zip for optimum venting
  • Machine washable at 60°C
  • Neck baffle to minimise drafts
  • Draw cord at neck baffle and hood for easy adjustment
  • Soft, easy grab zip puller
  • Comfort zip garage at top of main zip
  • Suitable for Duke of Edinburgh Award expeditions
  • Comfort temperature for women: +1°C
  • Temperature ratings comply with EN13537:2012 (most up-to-date testing) 

This sleeping bag is ideal for:  Backpacking, trekking, canoe expeditions, Duke of Edinburgh, bivi camping, and autumn/winter camping.

Need something warmer?: try the Montana 4 


Jura warmer than you need?: try the Montana 2 or Montana 3


And for extra comfort, try the Mammut Air Pillow


Comfort Temperature: -5°C
Extreme Temperature: -22°C
Season: 3 to 4 Season
Unpacked Size: 221cm x 50cm
Packed Size: 21 x 29 (compressed)
Max. User Height: 195cm
Weight: 1600g
Insulation Type: Synthetic
Shape: Mummy
Draught Collar: Yes
Stuff Sack: Yes

Reviews (4)

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  • 3 out of 5
colder than it should be, 27 April 2015
By adibranch (derby)
Feels like a quality bag with good lofting and a soft silky materials.

Couple of problems though. The marketing on this (and the cards in store) take liberties with the temperature ratings. There is no way this is a 0 degree bag (or -5 if you want to take the 'extreme' measurement). I wouldn't recommend this for anything less than 4 degrees max. Admittedly, I sleep a bit cold, but I was cold in at 7 degrees. Its not a 4 season, so don't buy it for that reason. Autumn and spring months you'll be okay, but any less, forget it.

The other really annoying problem is that that zip snags, constantly, on the thin outer material. Oh, and it doesn't pack down small at all, about the size of long football.

The other problem is that the drawstring for the interior baffle is very long, flapping about inside the bag (and its in the middle of the bag, and not the side)

I like it overall, but its big and heavy for the temps you can use it in, and has its faults.

  • 5 out of 5
Good bit of kit, 02 February 2015
By Aldo (Wishaw)
Bought this bag to cut down on space in my pack, was warm enough on Salisbury Plain for 10 nights in a large barn. I did use the bag with a bivvy bag but was able to sleep comfortably down to -5ish in just pants and t shirt. Great bit of kit well worth the money.

  • 5 out of 5
Amazing Quality, Great Price, Very Warm!, 20 January 2015
By Gav (Edinburgh)
Had this bag just over a year now and its had a bit of a battering through the summer and winter months. In the summer time, this is maybe a bit warm, however i usually zip the bottom end of the zip half way (to around my knee from feet) and this has worked well to keep me slightly cooler. The fabric is amazingly soft and comfortable and the bag itself although not a lightweight bag, is still acceptable when carrying. Overall a very good purchase.

  • 5 out of 5
Exactly what it says on the tin., 11 June 2014
By the ibiza hippy (Kidderminster)
Light weight, very warm bit warm for me at this time of year, but it will serve well in the colder months. Packs down really small as this was a key feature for me. I can't find a bad thing to say about it.