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I use sea to summit ones. From cotswold outdoor. The ultrasil
They're very light and robust.Does you sleeping bag not have a stuff sack? You should be able to get a waterproof stuff sack.
That said, it can be as fast if not faster to use a dry back to stuff a sleeping bag in. Plus you can pack it inside the bivi bag and also with the camping matt in one. That's what I do when touring. Qucik and simple. -
Give your Viscacha the shower test. Stuff it full with newspaper so that the seams are under a bit of strain and take it with you the next time you get in the shower. Just leave it there on the floor and when you're done, see if any of the paper is wet. If it is, drybag, if not, you'll be fine.
I think we've used the Lifeventure ones and they seem good. See what's on offer at Cotswold, Go Outdoors, Alpkit, they all do fairly good stuff.
Where can I buy dry bags for use in my Revelate Viscacha?
I now have a down sleeping bag I want to keep dry and the Revelate Viscacha doesn't have sealed seams so will leak eventually, right?