A lightweight liner that boosts your sleeping bag's warmth by 10°C. On its own, the lightest of sleeping bags. A PHD 'K Series' product: warmth to weight at the limit of possibilities.
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This is the lightest PHD bag ever for the minimalists. But it's called the Filler Bag because that's what it was primarily designed for, to fill the space inside your ordinary bag, providing significant extra warmth at the lowest possible weight.
Our Minim Overbag and Hispar Overbag bags perform really well as overbags, adding their insulation on the outside. The beauty of the Filler concept is that it works from inside, softly expanding into the unused space and cutting out the convection currents. The Filler is less than 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 Ultra K or Minimus 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 standard ultralight 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.
Materials
When it came to the materials to make the most of this design concept we had no choice, we had to use 1000 down and our new 10X fabric. The unique piece of kit we ended up with weighs just 240gm and goes into our size 0 stuff sac (10 x 18 cm).
Solo use
Just coming back to where we started, using the 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.
