Help selecting a waterproof stuff sack for storing my down sleeping bag

The was a comparision of dry sacks which looked at a number of options.

I don’t have a lot of experience. have tried the Sea to Summit ultra-sil, hydrolite stuff sacks, and the Outdoor Research Helium Dry Sacks. All have been effective on rainy backpacking trips when water resistant protection was adaquate. The helium dry sack has also be used on more water oriented outings like kayaking and done well and done fine. The ultra-sil failed a bathtub test so it has been relegated to uses where water resistant is good enough. The other approach is to use a pack liner such as sold by gossamer gear.

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Thanks for the pictures of your scientific process.

Why not make your own out of 1.3 oz silnylon plus some silicone sealer (hardware store variety is fine, thinning helps) and a bit of cord. Stuff sacks are the easiest thing in the world to make, as long as you can sew a straight line. Buy some silnylon (cosmetic seconds are fine), get scraps from a friend, whatever.

I like the RayWay design, with the long fabric tube at the mouth that can be wound up and folded back down. These are as waterproof as you can get in a UL stuff sack.

I also use a 2 mil polyethylene pack liner, just to be safe!

David I use Exped Dry bags and they work. I put my down bag in its own dry bag and all my gear then goes in a 65L dry bag all made by Exped. I live in the UK and it rains a lot and I have never had wet equipment.

plan B.

size L, 25 Liters, 65 g (manufacturer's specification 56 g)

Western Mountaineering bag.

if you like having your sleeping bag filling up space why not get a contractors trash bag (thick mil) with a rubber band and always have the hole pointed to the ground? maybe im just a cheap-o. only downside would be possible condensation. aloha!

Two supermarket plastic bags.
Stuff sleeping bag, tie top.
Turn upside down, put in second bag, tie top.
Push into bottom of pack.

Pack is lined with another bigger plastic bag that everything goes inside of. Sleeping mat is wrapped around inside of pack perimeter as 'frame'.
Has worked so far.

Although if swimming rivers/creeks I would do something else.

I 2nd the trash compactor bag idea. You can get a roll of 10 2-mil bags from Wal-Mart for less than $5. Cheap, tough and waterproof. And best of all if you ruin 1 you have 9 more.

Third on compactor bags. I've been on the same box of thirty of these for years. Cheap, durable, waterproof.

Fourth on Trash Compactor Bags.

I will add that I've kept my down bag dry in them when my entire pack has been submerged while using it as a floatation device.

…my OR Dry Sack came in the mail on Saturday. Looks like the chorus of support for the trash bags came too late!

Oh well, it wasn't expensive and it'll be fun to experiment with various set ups.

Thanks for all the info and opinions. Appreciated as always.