Wafer Half Bag: 'K Series'

Our lightest half bag (pied d'elephant) to insulate legs and feet. Camp down to 10°C and bivvy down to between 5°C and 0°C.*
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.
10°C / 50°F
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.
165g / 6oz
Wafer Half Bag: 'K Series'


  • Outer and inner fabric – Ultralight 10X (10 Denier fabric – 26gm/m)
  • PHD's unique 1000 fill power European Goose down
  • Stitch-through construction to prevent down shift
  • Oval foot-piece for comfort
  • Stretch draw-cord with cord lock
  • Stuff sac – 10 x 18cm*
  • Colour: Navy

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


Camp down to 10°C and bivvy down to between 5°C and 0°C.*

Half-bags need to be light, and the Wafer Half Bag certainly hits the mark. Add this 165gm item to your pack and you're set up for a lightweight camp at 10°C (as long as you have a warm jacket) or a bivvy down to about 0°C.*

Half-bags are back

Half-bags (Pied d'elephant to oldies) are coming back. They've been out of fashion for many years in the trend towards using lifts and huts to make quick comfortable ascents, when a bivouac was a mistake, not a plan.

But the logic behind half-bags is still valid. If you're wearing a warm jacket already, all you need to spend the night out is something to keep your legs warm and there's no lighter way to do that than to use a half-bag. Check out the weights of PHD's half-bags and see for yourself.

  • When there's no hut in the right place for your climb, or it's full, or you just don't like the crush
  • When you want to wander along your GR, free to sleep inside or under the stars as the fancy takes you
  • When you want a lightweight backup in case weather, miscalculation or accident catch you out

...A half-bag is the lightest answer.

*Note on Temperature Ratings

We have given two separate TOTs (Typical Operating Temperatures) for this half-bag.

  • 'Camp' is for the times people might want to use it for lightweight camping instead of taking a sleeping bag (an appropriate jacket and ground insulation is assumed): this is a standard TOT, meaning you should be able to get a good night's sleep under normal circumstances.
  • 'Bivvy' gives a range of temperatures from the usual doze level down to the point beyond which you're liable to be awake and getting cold. Again an insulated jacket is needed.

All these figures assume you are wearing normal clothing inside the half-bag. Any insulated kit like down trousers and down socks will improve the TOT.

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.

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.

Works well with
From £375.00 190g 0℃
One of the lightest insulated jackets. A combination of an exceptionally lightweight...
From £297.00 130g 0℃
One of our lightest insulated vests. A combination of exceptionally lightweight 10X...