Hispar 600 Down Sleeping Bag: K Series

Warmth to weight taken to the limit with our 'K Series' version of this mountain lightweight for low temperatures and high peaks. Ideal for fast ascents and quick travel.
Typical Operating Temperature
Guideline minimum temperature. Sleeping Bag TOT: you should get a night’s sleep, under normal circumstances. Clothing TOT: you should feel warm enough, assuming low/moderate activity. Sleep System TOT: relates to full system. For more details, see our Technical Briefing.
-21°C / -5.8°F
Weight
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
885g / 31oz
Price
£1,199.00
Hispar 600 Down Sleeping Bag: 'K Series'
Hispar 600 Down Sleeping Bag: 'K Series'
In Blue Ultrashell with Charcoal Ultrashell contrast
Showing collar and double draft tube
In Burnt Orange Ultrashell, showing short side zip (full zip optional)
On expedition to Mt Deborah, Alaska with Jon Griffith and Will Sim.
On expedition to Mt Deborah, Alaska with Jon Griffith and Will Sim.
On expedition to Mt Deborah, Alaska with Jon Griffith and Will Sim.
On expedition to Mt Deborah, Alaska with Jon Griffith and Will Sim.
As used by Jon Griffith and Andy Houseman in their 1st ascent of Link Sar West, Pakistan (photo: copyright Jon Griffith)
As used by Jon Griffith and Andy Houseman in their 1st ascent of Link Sar West, Pakistan (photo: copyright Jon Griffith)
As used by Jon Griffith and Andy Houseman in their 1st ascent of Link Sar West, Pakistan (photo: copyright Jon Griffith)
As used by Jon Griffith and Andy Houseman in their 1st ascent of Link Sar West, Pakistan (photo: copyright Jon Griffith)
As used by Jon Griffith and Andy Houseman in their 1st ascent of Link Sar West, Pakistan (photo: copyright Jon Griffith)
Hispar 600 Down Sleeping Bag: K Series
Hispar 600 Down Sleeping Bag: K Series
Hispar 600 Down Sleeping Bag: K Series

The kit is incredibly efficient weight vs warmth. The 1000 down that you use is just insane for lofting power.
Jonathan Griffith using the Hispar 600 on the Moonflower Buttress in Alaska, USA.

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Features & Description
Technical info
Reviews

Features

  • PHD 'K Series': Ultimate warmth/weight performance
  • Unique PHD 1000 fillpower Down
  • Outer: Ultrashell water-resistant fabric. An excellent balance of weight, water-resistance and breathability
  • Inner: Superlight 10X fabric. Down-proof, wind proof and super soft
  • Box-wall construction for max loft
  • Short zip protected by double draft tubes
  • Pack size: 23 x 40 cm†
  • Straight-wall baffles for lightness
  • Side block baffles to prevent down shift
  • Extra down channels along each side ensure side insulation
  • Oval footpiece to fit naturally to feet and avoid pressure
  • Ultrashell inner panels at head to protect against breath soaking the down
  • Ultrashell panels at inner foot to cope with damp feet/footwear
  • Mummy hood draws up close around head
  • Collar seals in warmth at neck
  • Stuff sac with mesh storage bag
  • Options:
    • Waterproof Dri-LX outer fabric shell (+250g)‡
    • Slim, Wide and Extra Wide widths*
    • Short, Long, and Extra Long lengths*
    • Full zip (left or right)
    • Further customisation available via our Design Your Own Sleeping Bag service

†Please note: We make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the bags to the tightest minimum.

‡Please note: The optional waterproof Dri-LX outer provides an extra seam-sealed outer shell to the bag. While a shelled sleeping bag is not designed to be used alone in heavy rain (the hood area is open to the elements) the shell does protect the bag when it is used outdoors without a tent.

*Please note: For all length or width options, we change the amount of downfill to keep the warmth (TOT) the same.

Description:

This K Series product has been created for one single reason, to take warmth-for-weight performance to the limit of what's possible. Unique 1000 down, super-light materials, and specific design features mean that the word Ultralight now applies to this wide range of gear that will take you to the Poles as well as on a Sahara Marathon. More on the K Series...

Ultralights for the mountains is what we have always called Hispar sleeping bags and even with the new K Series versions it's hard to find a better way to describe them. Perhaps 'Ultralightest' would be closer if it wasn't such an awful word.

The combination of this bag's design with the superlative quality of our 1000 down and our new fabrics, Ultrashell and 10X, almost send the Hispar K range off the scale for warmth/weight performance.

  • The straight-wall baffle system (as used on the Minimus) is the lightest available.
  • The close-fitting mummy hood borrowed from the high-performance bags brings a snug protective feel.
  • The Ultrashell inner panels at the head and foot help protect the down from damp.
  • A short zip with a double draft tube is standard on these bags (a zip is necessary with a mummy hood), and side block baffles have been inserted to prevent down shifting between top and base.
  • The outer V baffle at each side protects the side seams and increases the inner/outer differential to allow the down full loft.
  • A simple internal collar completes the technical specifications.

The weights of the Hispar K bags are graphic evidence of the effectiveness of this specific design. With the added performance of our 1000 down these bags deliver the greatest possible warmth per gram.

The optional waterproof Dri-LX outer provides an extra seam-sealed outer shell to the bag. While a shelled sleeping bag is not designed to be used alone in heavy rain (the hood area is open to the elements) the shell does protect the bag when it is used outdoors without a tent, for example in a snow-hole or under a tarp.

Dri-LX (weight: 64 gsm)

At just 64gsm, Dri-LX is our lightest 2-layer breathable waterproof rip-stop nylon fabric. Its remarkably low weight not only makes for a lighter load, but also reduces pack size. Its excellent waterproofing qualities are in part due to how it can be taped at the seams to create a waterproof shell for sleeping bags and clothing.

Ultrashell (weight: 40 gsm)

One of the lightest of PHD's coated materials. This ripstop nylon provides complete wind block and good water resistance at minimal weight. Ultrashell gives an excellent upgrade to performance with very little weight penalty.

Ultralight 10X fabric (weight: 26 gsm)

10X, PHD's first 10 Denier Fabric. 9,000 metres of the yarn used to weave 10X weighs just 10g, that's about the same as a £1 coin! For all its thinness 10X is amazingly downproof and with reasonable care will go on giving you good service for years.

Sleeping bag zips

  • No zip: The standard design on our lightest bags with open hoods. The simplest/lightest system which is a must for adventure racers. Up to 140gm (5oz) lighter than a full zip with draft tube.
  • Full zips: Full zip bags ventilate well, so they can be used over a wider range of temperatures.
  • Short zips: Short zips are lighter and pack smaller than full zips. A short zip & draft tube is up to 85gm (3oz) lighter than the full version.
  • Our full briefing on sleeping bag zips.

1000 fillpower down

This rarest of all downs we reserve for the K Series. European goose down of unique quality. 1000 provides the highest warmth-for-weight performance possible from down. More on our down insulation.


Construction

This bag has an insulating straight wall baffle system throughout (no straight-through stitching). Straight wall is the lightest of all baffle systems. In cross section it looks like this:

Side V channels, and double draft tubes behind the zip optimise insulation.

More on sleeping bag construction.

Proofed inner panels

Proofed fabric (Drishell or Ultrashell) panels are included inside the hood and foot areas of the bag to help keep the down dry. In very cold temperatures your breath can cause ice to form around the face opening, which may soak into the down as it melts. The panels at the foot end are to protect the down if you get into your bag with wet socks (or in extreme situations with your boots on).

"I have used it in temperatures down to -22°C and always felt warm. It is amazing how you can get so much warmth out of a 900g bag that packs so small. Thank you for your superb down gear."
— Ben Clayton-Jolly

Reviews relate to standard Hispar 600, which is 125g heavier

"The kit is incredibly efficient weight vs warmth. The 1000 down that you use is just insane for lofting power. We nicknamed the Hispar 600 bag the 'big yellow sausage' (yes i know not very imaginative) as every time i got in it the whole thing just inflated massively."
— Jonathan Griffith using the Hispar 600 on the Moonflower Buttress in Alaska, USA.

"This bag has an unmatched warmth / weight ratio ... The draft tubes undoubtedly provide the best insulation behind the zip of all the bags tested - not a trivial detail if you face harsh conditions."
— from Carnets d'Aventures Magazine's test of 18 sleeping bags for cold conditions.

"I have been warm at night in minus 25 degrees C with the Hispar 600 alone. The local people were very impressed that I was warm in such a light sleeping bag."
— Jeanette Lykkegård Nielsen using the Hispar 600 studying reindeer headers on the Kamchatka peninsula, Siberia.