This has been discussed on some threads on a couple of UL Backpacking sites Stateside. There were questions concerning durability and re-compressability after it escapes it's vacuum packing---supposedly, it is hard to repack into a small volume. The fact that the bag is waterproof raises yet other concerns such as condensation within the bag.
Still, it looks interesting...
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Wasn't the blizzard designed as an emergency item, and not something you would use on a regular basis?
I have one, and think it is superb for the assurance of a waterproof and warm bag that will keep me alive overnight, and weighs 350 grams. In that situation repackability and breathability are non-issues.
However, it people are starting to use it as an everyday ultralight product, then I imagine that it wouldn't fare very well!
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 It's meant to handle condensation pretty well because it's 3-layer construction and the inner two have small perforations which allow any condensation to be driven away from the body.
And I've seen one repacked - no ,it won't go as small as the original vacuum-packed packet, but it still scrunches down to a reasonably small bundle, especially if you take a bit of time and trouble over it.
That said, I carry mine as an emergency item through the winter, so I've not tried it first-hand yet.
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 We carry them as emergency items. Pals have used one in that vein on a ski tour when a client pranged a knee, and everyone was most impressed with the result for sitting around in the snow waiting for some help to arrive.
Neither they nor I are queuing up to replace our conventional bags with them, but where weight is an absolute priority it would be worth looking into. Certainly a great emergency item, when vaccuum packed they're about video-casette size. Last ski tour we took these rather than bivvi bag plus sleeping bag.
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Have used them loads - very warm, quite sweaty in moist conditions. very durable for their weight. Repack well if you use a hoover! Also nice & long. Good for wet people as insulation is not lost by dampness. Best used with conventional orange bag due to heat radiation issues. Also remember a blanket below is worth 2 on top. So get the person on a karrimat as a priority!
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 Could this be used an insultaion layer in clothing for example a gilet made of pertex could be filled with this rather than down or syn insulation ????
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 This page suggests that a Vest was once an option, although it no longer seems to appear on their list of products. * assuming the Session-based URL can be seen. If not, this picture might show the vest..
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 "good for wet people" Matt is that why you've got one?
<runs>
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they were 'featured' in one of Wednesday 20th June's BBC News reports from the US casualty receiving station at Camp Bastion, Kandahar.
a US 82AD Soldier was filmed being airlifted into the CRS on a stretcher, he was wrapped in a Blizzard bag.
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 I've also used one overnight to try it out. It was a little damp towards the end of the night - but I still slept OK. I would use it for a planned kip again in the summer if I was trying to go really light. Crucially, were I to be benighted somewhere in the winter, I reckon I'd even get some sleep - whereas I wouldn't really be that confident of even surviving the night in a poly bag.
I reckon I can get mine down to twice its original size when I try hard. I might get another to use as emergency kit and keep the one I've used for other planned bivis.
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It's basically the same idea as used in the Ambulance Service / A/E, and post operative care that's been used for years. Nothing new really. Used this method of keeping people warm for years.
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Actually this is nothing new. It's an idea thats been adopted from the Ambulance Service, A/E dept. Used this idea for years keeping patients warm.
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 i believe they're made by a company in Llanberris who will re- vacuum pack them for a price.
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