Montane Prism Sleeping Bag

0°C Comfort Limit (EN13537:2012), 160g of Primaloft Silver Eco
Weighs 1240g
Code: SS14640
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Montane's Prism sleeping bag uses leading edge Primaloft synthetic insulation to create a tough bag with a highly technical construction and laced with useful features that work.

Montane Says:

Created for rough and tough conditions, the Prism sleeping bag was conceived for expeditions where high levels of moisture are expected, durability is needed and consistency of function is a pre-requisite, regardless of the sleeping conditions, or what the sleeping bag has been through. PRIMALOFT® is highly resistant to moisture and will maintain much of its insulation even when wet, whilst the PERTEX® Microlight outer shell is windproof, fast drying and highly breathable. One of the most technical synthetic sleeping bags on the market, the Prism has a tailored anatomical form and top stitch panelling across the body to prevent PRIMALOFT migration.

Comfort 5C / Comfort Limit 0C / Extreme -16C

Primaloft logo at Ultralight Outdoor Gear | PrimaLoft® Silver Insulation Eco; Uses recycled content to create the highest performing eco-friendly insulation available.Click Logo to read more...
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Montane's Prism Sleeping Bag is designed to be tough - but also to be a high performing synthetic bag. Primaloft insulation is widely recognised as being one of the best on the market and some of the features included in the construction of the bag would normally only be found in more expensive down bags.

Focussing on the things you can see reveals some really neat touches, the antisnag zip baffle finally looks like it works - Montane have stitched two small piped baffles the full length of the zip, these really do the trick and its difficult to see how the zip could possibly snag.

The footbox is interesting - its shaped to accommodate feet that are pointing into the air - assuming you are sleeping on your back - if this is you then it just might be the innovation you've been looking for - if you sleep on your side the bag will twist slightly to accommodate your feet - we're luke-warm on this as a feature.

We really like the inner fabric though - the 'PEAQ Down' lining fabric is still an out and out nylon fabric but it feels less clingy than the Pertex Quantum that you will find lining the lightest bags. The hood is well designed to give good coverage, more like a garment hood.

On the base of the bag Montane have added silicon dots to help keep the bag in place on your mat - these do make a difference, and inside the bag you have the mp3 pocket and a second pocket for a water bottle - both useful features.

So, if you are not buying the lightest sleeping bag in its class you are buying a very able bag which won't annoy you with jammed zippers, will feel more comfortable than some lighter bags and has a really good fit, from hood to collar to footbox.

- Reviewed by Ultralight Outdoor Gear

Read reviews here:                                                  
Help and advice: Choosing a sleeping bag advice EN 13537 rating for sleeping bags explained All about down filling in sleeping bags
Sleeping bag shape and sizes advice Sleeping Bag features Page 1 Sleepin bag features page 2
  • Activities: Mountain Camping / Backpacking / Trekking / Basecamp / Travel
  • Constructed from PERTEX Microlight that is lightweight, windproof, breathable and features a durable water repellency
  • PEAQ Synthetic liner that is comfortable next to the skin, highly breathable and fast drying
  • PRIMALOFT ECO that is lightweight, warm and dries remarkably quickly
  • ¾ length YKK VISLONzip that is angled away from the shoulder to prevent body contact whilst user is sleeping on side and to allow easier access from inside
  • Fine microfleece facings and roll over Velcro closure flap at top of YKK zip for extra comfort
  • Two way YKK VISLON zip for lower access or ventilation whilst zip is drawn up
  • Sleeping bag zip opens fully at bottom to completely open sleeping bag to aid airing and drying
  • Locking zip heads to avoid unexpected zip opening
  • Glow in the dark zip pulls for easier night time location without head torch (not on Olive version)
  • Single volume baffle behind YKK zip
  • Outer and inner anatomically designed shape tapers around lower legs and curves around shoulders
  • Side walls to upper part of body ensure there is insulation to shoulders and head area whilst sleeping on side
  • Top stitch lines across outer shell to fix PRIMALOFT insulation in place and prevent synthetic migration
  • Flipper shaped foot box in lower leg area tapering from knees to ankles which helps reduce cold spots. Specifically tailored to cater for upright foot position
  • Neck baffle is specifically shaped to encase the whole circumference of the neck
  • Drawcord arrangement in baffle enables further adjustment and pulls insulation closer around the neck
  • 3-D shaped hood design based on years of MONTANE clothing construction experience, in particular the award-winning technical mountaineering jacket hood design
  • Split, colour coded face drawcords to control and adjust volume individually around upper and lower face. Drawcords easily accessed from inside the sleeping bagSoft brushed microfleece inner next to chin and mouth area
  • Underside of sleeping bag features non-slip silicone MONTANE roundels to help grip sleeping mat or bivvy bag
  • Foot box hang loops for storage and drying
  • Internal stretch mesh water bottle pocket on right hand side
  • Internal pocket on left hand side with concealed YKK zip for storage of MP3, mobile phone, GPS etc.
  • Includes MONTANE cotton storage bag and dry bag
  • Dry bag storage doubles as a pillow whilst stuffed with clothing and features a non-slip silicone roundel for extra grip. Features pull handle on base
  • Dry bag shape differs from traditional tub stuff sacs; constructed with a packable shape and to fit more easily in packs
  • EN13537:2012 Comfort: +5°C
  • EN13537:2012 Comfort Limit: +0°C
  • EN13537:2012 Extreme: -16°C
  • Fabric: PERTEX Microlight
  • Fabric denier: 30D x 30D Rip-stop
  • Lining: PEAQ Synthetic
  • Zip: ¾ length YKK VISLON
  • Weight: 1240g
  • Weight stuffed: 1,216.3g / 42.9oz
  • Internal length: 1,940mm / 76.3in

Packed Size: The Prism comes with a rolltop stuffsack which has a narrow oval cross section 30cm at the widest point and 9cm at the narrowest. The bag can be stuffed in this and compressed to about 33cm long. If compression size is important to you you could buy a compression stuffsack and probably reduce this by about 20-30%.

EN13537:2012 - Look for the 2012 label for the most accurate rating; In 2012 the EN system of testing sleeping bags was re-vamped - the new testing procedures are more rigorous, producing more consistent results than previous tests. 2012 results tend to rate sleeping bags as poorer performing by a few degrees when compared to previous test results, even though the sleeping bag may be identical, or even better.

This means that comparison between an EN13537:2012 rated bag and an EN13537:2002 rated bag are particularly difficult - our advice is to use the new EN13537:2012 rating to compare with other bags who have also been rated in this way.

Showing our 1 review for Montane Prism Sleeping Bag. Write a review ›
Review Summary - 5 out of 5 based on 1 rating.
January 21, 2017 | E Bowman
Excellent workhorse sleeping bag

This is an excellent sleeping bag that has served me well. When combined with a good air mattress, it really keeps me warm. Importantly, the synthetic materials really are much less prone to wet and damp conditions than down. It is definitely much larger and heavier than my down quilt, which I use when I am certain the weather will be dry. However, I live and camp in Scotland, so damp and rain are ways a factor and I feel safer when there is a possibility of rain to use the Prism sleeping bag (with down or merino clothing for additional warmth if need be). The sleeping bag is very well made - I cannot fault the construction quality at all (as one would expect from Montane).

The compression sack is somewhat oddly shaped, and I am not convinced it works better than a conventional one. But that is such a minor thing that it is almost not worth mentioning.

Overall a quality product from a fantastic company. I am very happy with my purchase.

Ultralight Outdoor Gear Limited