Do they exist?
Going trekking for 5 weeks this summer and this week I am starting to plan my system for packing. I have decided what I want to do is to organise everything into stuffsacks and then put everything inside a large, 30-50 ltr drybag. I'm only taking 2 and a half sets of clothes, so whilst I will obviously be wearing one set the other will be in my bag- so for safety reasons (it can be quite cold where I'm going) I want to have a back up system in case the drybag fail, as if my pack is wet the likelyhood is so am I - Hence the need for waterproof stuff sacks.
A quick google search comes out with nothing.
Very much so and in numerous types - a good cross section here.
The only ones which count as really waterproof are small drybags of course, as the hole is a hindrance otherwise
Slightly oddly perhaps the podsac website at least does seem to imply that they seam seal their stuff sacs. Other people perhaps do?!
Abrasion... up to apoint, with sufficiently heavy use after a while, but I'd say a bit of a non-issue TBH. Use something like Ortliebs which are bomber enough (even their lighter ones) and it's even less of a worry.
But if you think about it, if a dry-bag is going to ruin your bigger dry-bag you'd better leave out anything with zips and buttons etc...
Seriously I wouldnt worry about dry bags inside dry bags, its overly conservative IMO. Even if your dry bag does develop a hole you could patch it with duct tape (which is generally a good thing to have in your pack anyway) If you put wet clothes in your dry bag just carry a polythene bag to stop them getting everything else wet.
I have been using mutliple dry bags to waterproof kit for years and never had a problem, this has also kept my kit dry in all weathers, terrain (including the jungle) and also during several river crossings.
"Seriously I wouldnt worry about dry bags inside dry bags, its overly conservative IMO. Even if your dry bag does develop a hole you could patch it with duct tape (which is generally a good thing to have in your pack anyway) If you put wet clothes in your dry bag just carry a polythene bag to stop them getting everything else wet.
This approach maybe fine for day hikes were dry clothes/sleeping bag aren't critical but on a mutli day hike i would say having your kit waterproofed properly not only improves your comfort levels but in certain situations can be a life saver.
I'd not go for binliners 'cause IME they rip too easily. A rubble sack, OTOH, is cheap, easily available and generally tough enough to remain intact when needed.
As for the critical life-saver of a dry bag, the bag will be in the inside dey-bag without the hole, so it's still nae bother.
Because we are going to be too far away from a source to replace kit I have adopted a worse case scenario approach to everything
Well, up to a point... There's actual worst case and reasonably likely worst case. The first is impossible to deal with and the second must account for a bit of leeway.
If you've got 10 folk you are most unlikely to destroy 10 dry bags, so you don't need 10 spares. 1 or 2 might be smart, but if every individual takes multiply redundant gear for everthing the worst case is you won't be able to move! The more folk you have the more slack you can have in the system. You're cold and your spare jumper is wet? One of your nine pals might be able to lend you one for a while...
Alpkit Airlocks are the cheapest dry bags i've seen so far...I'm not doubting their quality either...I trust Alpkit stuff
I agree with AN - dry bags in dry bag is overkill IMO and it's surprising how these little things add weight. I have used an Exped 40 litre dry bag as a rucsac liner for several years - it's fine. I don't know what you'd do to wreck it!
My sleeping bag and duvet go in their own stuff sacs, which are at least water repellant. Only things I really want to keep dry go in this bag. I sometimes carry a 13 litre dry bag or stuff sac to keep near the top of my sac, so I can put a fleece in it if I have to shed a layer. Same bag can be used inside out to contain my waterproofs if wet, as a pillow (if I am wearing my spare clthes for warmth). I have not had a problem with this system yet...
I suppose you could use stuffs sac made of waterproof material (Alkit are good). Guess you need to consider just how serious getting stuff damp is. Life threatening? And if there's so many of you, surely you can help each other out? Where are you going (if you dont mind my asking?)?
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