Greenlandic Filler Down Sleeping Bag

A lightweight liner that boosts your semi-rectangular Greenlandic sleeping bag's warmth by 10°C. On its own, the lightest of semi-rectangular sleeping bags. 
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.
15°C / 59°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.
340g / 12oz
Greenlandic Filler Down Sleeping Bag

One bag that's stood out over the last two years has been the tiny Filler sleeping bag.
Andy Kirkpatrick.



  • Neck-length bag
  • A semi-rectangular shape sleeping bag
  • Fits inside main Greenlandic bag to boost warmth. Or an ultralight summer bag by itself
  • Exceptional PHD 950 fillpower Down
  • Outer and inner: Superlight 10X fabric. Down-proof, wind proof and super soft
  • Construction: Stitch through seams for lightness
  • Stretch draw cord with cord lock at shoulder
  • Pack Size*: 10cm x 18cm
  • Footpiece: Wide and roomy for wriggle room and comfort for side sleepers
  • Stuff-sac and mesh storage bag supplied
  • Colour: Navy blue
  • Options:
    • Slim, Wide, and Extra Wide widths†
    • Short, Long, and Extra Long lengths†

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

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


This is the lightest Greenlandic Sleeping bag ever for the minimalists. But it's called the Greenlandic Filler Bag because that's what it was primarily designed for, to fill the space inside your semi-rectangular bag, providing significant extra warmth at the lowest possible weight.

The Greenlandic bags are a widened semi-rectangular shape with a wide foot-piece for more wriggle room. Made in exceptionally light fabrics and filled with 950 down these superlight & spacious “big foot” down bags deliver remarkable weight to warmth performance and free-moving comfort. 

Our Greenlandic Overbag bag performs really well as an overbag, adding insulation on the outside. The beauty of the Greenlandic Filler concept is that it works from inside, softly expanding into the unused space and cutting out the convection currents. The Greenlandic Filler is around a third the weight of our external overbags and a quarter of the bulk.

Does it really work?

Yes, it does. When the temperature's dipping too low for your semi-rectangular Greenlandic bag, you'll find this little extra will shift the shivers. Of course it's not as warm as the external overbags, which will add about 20°C to the temperature rating of your bag. The Filler can add up to 10°C, putting it squarely in the frame for ultralight camping beyond the summer season. It's aimed at boosting lightweight bags, but of course it will work inside any bag anywhere.

Is it comfortable?

Yes, it's as wide as our semi-rectangular Greenlandic bags, so there's no feeling of restriction, and it's so soft that it will naturally fill those empty spaces around you. And there certainly are spaces, even in slim-cut bags: few of us would accept the straight-jacket effect of a truly body-fitting bag. The Filler bag offers the best of both worlds: you keep the freedom to move and you get rid of those cold spaces at the same time.


When it came to the materials to make the most of this design concept we chose the same high quality as the Greenlandic bags, we used 950 down and our soft 10X fabric. The unique piece of kit we ended up with weighs just 340gm and goes into our size 0 stuff sac (10 x 18 cm).

Solo use

Just coming back to where we started, using the Greenlandic Filler as a single sleeping bag. It's shoulder length (closes at the neck), so you'll need some kind of head cover. And what you're wearing inside will make a big difference to the temperature rating. 

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.

950 fillpower down

A newcomer to our range. European goose of rare quality. A high value alternative at the top levels of performance. More on our down insulation.

The reviews below are for our standard Filler sleeping bag:

"One bag that's stood out over the last two years has been the tiny Filler sleeping bag. I've used the bag a lot, both as a bag in its own right, both as a stand-alone bag but also as a 'sheet' style bag in hostels and grotty hotel beds (good for keeping the bed bugs out), as well as a liner bag in both down and synthetic bags. One way the bag works so well is that it both insulates as well as reduces convection inside the bag, filling in the dead air space. Sleeping in the desert can often see you feeling very hot when the sun goes down but shivering at 3 am. And so I would often go to sleep with the bag around my knees and slowly pull it up as the night went on."
Andy Kirkpatrick. Read full review

"On a couple of occasions, faced with frigid temperatures, I've tried stuffing two sleeping bags together. Sadly, it's a fix that never works! The size mismatch always leads to compressed insulation and more cold spots than you can shake a stick at. PHD, with some neat design tricks, have cracked this problem and, in the process, come up with a highly flexible sleep system. As well as allowing sleeping bag layering, the system also takes into account other down clothing. Basically, you have a main sleeping bag which is size-matched to an inner bag. You can pick and choose for the main sleeping bag. This is then paired with a Filler Bag that can then either be used on its own as an uber-light summer bag (packs up not much bigger than my first), or can be paired with the main bag to boost the overall rating by a good 10 deg C. So, for me, the system works like this: paired bags for deep winter, solo main bag for the rest of the year, and then the inner for ultra-light trips at the height of summer. Verdict: An investment in flawless design that will last and last."
Jeremy Ashcroft, Mountaineering Editor, Trail Magazine

"A genius idea"
Trail Running Magazine

"I have a long-held belief in the 'layering principle' extending into sleeping bags. PHD's bags suit a multitude of adventure activity situations including:

  • Expedition sea kayaking
  • Himalayan style trekking where you travel through a wide range of temperature zones
  • Cycle touring where there is a similar packing issue to sea kayaking and potential for travelling through temperature zones
  • Plus, anyone who needs to use their sleeping bag across seasons. E.g. Just 'layer up' to convert your summer bag into a 'winter warmer'
During recent sea kayak expeditions in Greenland, my PHD Minim Overbag, Minimus, and Filler bags were tested in temperatures ranging from just above freezing to as low as -10°C. It is a pleasure, when you know the temperature is dropping, just to slip into another bag and double the warmth factor"
Sam Cook


""I 'bivvied' in the snow on the fell above my house. Inside a bivvy bag I was as 'snug as a bug' in the Minim Overbag and Filler. So much so that I slept until 8am. The temperature dropped to about -6°C."

"I used the Filler Bag in the Alps with great success. I happily slept in it, albeit with a vest and hat on, at temperatures down to around 12 degrees C and was perfectly comfortable. Saved a lot of pack weight. Thanks for a great product, the down you use is obviously of a very high quality."
Mike Jones.

"PHD has reminded us once again why it is one of the world's best manufacturers of lightweight gear with the release of its super-light 240g Filler Bag. When used inside a sleeping bag, the Filler is designed to expand in the unused space and cut off convection currents to add 10C of warmth. It can be compressed into an impressively small size zero PHD stuff sac (10x18cm)."
TGO Magazine.

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