 I am the happy owner of a brand new winter sleeping bag which I hope to field test tomorrow night (will post a report on the 'sleeping bag for iceberg' thread I started up last autumn). But I'm now looking for a compression sack for it and am quite taken with the Sea to Summit ones, particularly their eVENT one and their siliconised sn240 which is very light. Anyone had any experience of these, or any other compression sacks that will a) compress 'The Wasp' (phd Hispar) but not kill it, b) keep it dry and c) not add too much to the weight. Thanks 
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 Gave up on compression sacks sometime ago. I find the best option is just to put the item concerned at the bottom of the rucksack - compression comes from the weight above and it's much easier just to squash everything down from the top of the bag than fiddle with a compression sack. IMHO obviously!
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 You don't need a compression sack with a down bag. If you 'stuff' the bag into a stuffsack starting with the bottom, the act of stuffing itself will be enough to compress the bag. Using this method it is easy to compress the bag far more than is good for it. The trick is to get a stuffsack the right size so that when it is full and the whole sleeping bag is inside the bag is compressed just as small as it will go without being harmed. You can discover the right size stuffsack either by trial and error and judgement or, the best way, by phoning PHD and asking. Then all you have to do is get a waterproof stuffsack the right size. Stop drooling over your new sleeping bag and phone PHD.
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 > You can discover the right size stuffsack either by trial and error and judgement or, the best way, by phoning PHD and asking I've never bought a sleeping bag that didn't come with a stuff sack. Decent down bags come with both a stuff sack and a big storage bag. > Stop drooling over your new sleeping bag and phone PHD And say "where the chuff is my stuff sack...?" 
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It does have a stuff sack, but it's a bit on the big and flabby side. Not much smaller than the 'big storage bag'!
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 I agree, I'd be phoning them and getting a decent compression sack or stuff sack that is smaller! If you don't I'd recommend the Exped stuff sacks, I've got several and think they are excellent.
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 I really like the looks of that event one though, as its waterproof and compressable it would be ideal for a sleeping bag. Because its a down bag it would be worth getting a waterproof one for sure, and realistically for me at least, its got to be able to be compressed.
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 Kate, these are very good/ You might also be interested in this article regarding silnylon and waterproofness
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Actually, the link I've posted about the Exped sacks is for the large size. Small is fine for most down bags and can be found here
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Glyn, enjoyed the 'sylnylon and waterproofness' article. Thanks.
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you're welcome Frum, quite an eyeopener I thought
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Thanks, Glyn. It is very interesting, and useful
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Hi, I've got a sea to summit event compresssion sack and they are way better than anything supplied by the manufacturer. Try amazon for a good price. can not recommend them enough.
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In fairness to PHD, they do quite clearly state that their stuff sacks are generously proportioned.
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I like the very light sea to summit sil nylon roll top dry bags. For a winter weight down bag I find a 14-15 litre one compresses the bag as much as i'd want, not to over-compress and kill the down. This size also fills out the bottom of my pack nicely. I've read the articles about sil nylon ones not being up to full immersion etc - so if you're thinking of kayaking or likely to be in many tricky river crossing situations that might be a consideration. I've inflated mine like a balloon and left it for a couple of days without it getting deflated and also filled it with water and had no discernable drips or leaks, so I'm more than happy it will handle the rain ingress into a pack, which is what I'm most usually going to be protecting against. The alpkit ones also look like tremendous value though - as always with alpkit stuff.
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that's good value, Michael, but they're advertising them for compressing not just sleeping bags but cuddly toys too!! I couldn't possibly support a company advocating cruelty to cuddly toys!
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 You tell him Kate, teddies are not just for Christmas.
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