Down bag for Summer in Olympic National Park?

no

dry in summer, but there is occasional rain

I use down bag all year in Oregon and Washington, including Olympics, and never have problem

Take a look at LL Bean's Dri Down DWR treated down bags.

Personally I will never buy another down bag without a good down DWR treatment even though my Western Mountaineering Meglite bag is excellent in all other ways.

is there a case where your untreated down bag got wet and lost loft that wouldn't have happened if it had been treated down?

I live in WA. State and a regular down bag(quilt) is what I use with no problems.

I've used down around the PNW for awhile now and have never had an issue. If you have 6 days of rain in a row then the humidity might cause you to lose a little loft, but overall it shouldn't be a problem.

Take your down bags and enjoy the trip!

I have spent many weeks there and areas round about with a good old fashioned down bag and no problems.

Spent a night in the NH White Mountain NF in 35F and solid rain all night. Basically, 100% humidity. My Nunatac quilt lost significant loft overnight, but fortunately had enough reserve that I didn't get cold. Wouldn't have wanted to be out in a 32F bag that night.

Obviously, it depends on the kind of conditions you'll encounter. That night, I would have been better off bringing a synthetic bag.

Do you have any personal experience with any of the treated down products?

August is usally warm and dry. The challenge is if you get you down wet in a spate of wet weather, it will stay wet. Think days of drizzle and cold high humidity vs occasional thunder showers you get in the Rockies with direct sunlight to fluff up the feathers. 'm

All said and done, I would bring the down and dry storage. I wouldn't re-create your sleeping for one trip.

No, my down bag as not gotten wet because I'm very careful with it in wet weather and I've maintained a good DWR finish on its shell.

BUT, I have had a TNF doen parka soaked with sweat in 5 F. weather and it took forever (2 days) to dry out in camp. The sweat was from my pack resting against my back for 4 hours as we snowshoed into our first camp.

I won't risk wetting through with a sleeping bag, especially for a winter bag or one to be use in rainy areas.s

While living in the PNW, most of my trips were in the Olympics and I used a down bag regardless of the season and it worked perfectly – never an issue. In the rainy season(s), I used a S2S ultrasil dry sack for my sleeping bag…..coupled with a trash compactor bag for a pack liner and even in the heavy rain of the rainforest late March-early April everything stayed dry.
For the summer months…..I would use your current bag without a second thought.

Interesting Eric. I'm just curious about down getting wet incidents.

That makes sense that a jacket would get wet from sweat. Maybe that's an application for fleece, if it provides enough warmth.

I have heard of down bags getting wet when it's a lot below freezing.

"Do you have any personal experience with any of the treated down products?"

This is an interesting topic to me, too, but one thing's for sure: nobody has a *lot* of experience with these treated products–they're too new. Do they work? Do they work after 5 years? 10? 30? Do they work after one or two good dunkings? Do they degrade into something worse than untreated down? It'll be a while before we know. I'm sort of on the "what problem is it trying to solve?" side of the fence, but still on the fence.

Here's what Feathered Friends is currently saying:

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What about water resistant down?

Our main philosophy that applies to design also applies to our materials. Treated down that reduces water saturation is currently a buzz topic, and we are investigating and testing the technology. Before jumping in, we have major questions, namely: does treatment negatively impact the longevity of the down? Does the treatment wear off with considerable use? How much water does it take to null any gain from treatment? We've been producing down gear in the rainy Pacific Northwest for 40+ years. We explore and utilize new technologies we find beneficial for you, so in the meantime, we will use the best fabrics on the market to help prevent water from even reaching the down insulation.
—- Cut Here —-

Source: http://featheredfriends.com/faq/#water

It seems that the three premium down sleeping bag manufacturers, in my opinion (WM, FF, Valandre), are taking a wait and see stance. Feathered Friends being from the PNW has tons of experience with down and wet weather….and them not immediately jumping on board says something in and of itself.

i once did a 1-night autumn trip into the Emigrant Wilderness just N of Yosemite.
i convinced my 2 pals that due to the forecast & my abundant sierra experience, we should leave our shelters in the car and enjoy a night under the stars. [can you feel how this ends?]. sure enuf it rained steadily most of the night. my down bag was more than 50% soaked through. thankfully at least the temps stayed normal, it was a mild night, and the wet bag still provided ample insulation. never b4 or since have i been the butt of as many jokes as that day hiking out LOL.

Heh, heh, you can't blame the down for that! That's why I don't cowboy camp unless the car is within walking distance. :-)

Thanks everybody! This was super helpful. We are just going to stick with what we got! Might throw on a DWR though.