Sleeping bag specification…. what does it all mean?

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  • Sleeping bag specification…. what does it all mean?
  • Want to buy a new bag and will buy down. There is a nice looking Robens bag on field and trek, seems similar in spec to the Alpkit bags (all sold out)
    Whats the story with fill power, fill weight etc etc.

    http://www.fieldandtrek.com/robens-lite-700-sleeping-bag-781092

    http://www.alpkit.com/shop/cart.php?target=product&product_id=16321&category_id=286

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    Mammut’s ‘Sleep Well’ document is your friend.

    Part 1 (general info, measurement, history etc)
    Part 2 (specifically around Down bags)

    The 2 bags are actually quite different.

    Down v feathers, the smaller the gap in ratio the better: AlpKit 90/10 Robens 80/20 (X % down + x % feathers).

    Fill power, it’s a complicated test but in straightforward terms, the higher the number the more loft you have: Alpkit 650fp Robens 500fp (this really is pretty low)

    Down quantity: Alpkit bag contains 800g of down, the Robens contains 700g. Also, remember that the Alpkit bag doesn’t just contain more down, it contains more better quality down.

    I know it doesn’t really sound like much but the 2 bags will behave very differently

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