Using two down bags

Discussion in 'Sleeping Bags & Quilts' started by Diddi, Sep 24, 2018.

  1. liamarchie

    liamarchie Ultralighter

    Any consensus on whether it would be more effective to use a costco down throw on the outside of my down bag, or internally?

    Im just going to sew some simple bungee chord on the foot end to draw it tighter, and a loose chord across the top.
  2. WilliamC

    WilliamC Thru Hiker

    Unless your bag is (overly?) roomy and so big enough to allow the throw to loft fully, I'd imagine you'd want the throw on the outside as you could arrange it in a way that didn't restrict the bags loft.
  3. liamarchie

    liamarchie Ultralighter

    The throw doesnt really have much loft to it at all really, its quite a limp and flat looking thing. Think you're thinking its probably correct though. plus would mitigate any condensation splash, and move the dew point to out of my bag
  4. Bob-W

    Bob-W Summit Camper

    @cathyjc & @ZenTrekker I should have said "limit" rather than "comfort". IME that formula does get you in the ballpark, generally +/-2C, of the EN13537 limit rating of a bag.

    My wife is fine with her standard Cumulus 350 at -6C so by that score she's definitely a warm sleeper. That's got 6.5cm of loft so -5.3C by the formula vs -4C that Cumulus quote.
  5. Balagan

    Balagan Thru Hiker

    With the Costco throw, you really want to seam rip all of the vertical or horizontal seams as that really helps give the down a lot more room to loft than the small squares. A fair bit of down is trapped under those seams too.

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