I agree that the camelbacks are just not a good idea. They still freeze with those insulators, but you can thread them through your sleeve. Even so, the valve will freeze.
I have to disagree somewhat about the jackets for nalgene bottles. I've had them freeze solid on several occasions with the jacket again. We got pretty dehydrated on Silverheels because we couldn't drink frozen water. It was cold, but not extremely cold. When we left it was -14F when we started.
Here are my notes from the climb with highlights about the OR nalgene "insulator":Written December 11: I camped at Hoosier Pass at -14F, and the next morning, I met up with SP member Cgueck, and we climbed Silverheels via the Hoosier Ridge/North Face Spur. That route had lots of extra elevation gain, but pretty good snow conditions. We actually reached the summit around 2pm, but Cgueck was faster than me and arrived on the summit 10 minutes earlier. It was cold and windy, with the chill factor around -50F or so, so we only spent a few minutes up there eating lunch.
We then descended the NW ridge and then climbed Heartbreak Hill. Since climbing back up to the ridge would cause us an extra 600 feet of elevation gain and since we just climb Heartbreak Hill, I thought it would be a good idea to make a beeline to Hoosier Pass and cross the basin. Big mistake. We should have climbed back up to the ridge, and I was pretty dumb for suggesting the other route. We had also ditched our snowshoes after the first 30 minutes of the climb in the morning, so we didn't have them with us.
That route really sucked, and we got back to the vehicles two hours past the time it got dark and we were both exhausted. Both of us were also dehydrated because our water had frozen solid long before the end of the day. Everyone should remember that Nalgene water bottle jackets are completely worthless for cold weather and if its cold, your water will freeze solid even with the "insulating" jacket. I had a mountaineering thermos as well, but the lid was so frozen I couldnâ€™t open it, though I could hear liquid inside. Cgueckâ€™s water was frozen solid as well. I was also sore from the "incident" on North Star the day before. It was cold and windy, but not as bad as the day before on North Star.
Note that I also started out with hot water.
Anyway, her's a good way to test the Nalgene jackets or other devices. Fill your bottle with water and place it in the freezer overnight (24 hours is best) and see if it freezes. Anyone can try this, but trust me, the Nalgene will freeze (try it for verification). Everyone try it and post the results.
If it's cold, I would recommend one of these:http://www.rei.com/product/752887
They will not freeze. If it's cold you have to be careful though. Wipe the bottle dry before screwing the lid on. This will avoid getting it frozen stuck. As long as you do this, you will be fine.
I'm slow and fat. Unfortunately, those are my good qualities.