the insulated tubes make a big difference. Most of the time my bladder ices up is in the bite-valve itself, even when blowing all the water back in to the bladder. I've now switched to bottles, but for mountain biking I love my camelbak.
I prefer to use a bottle with a tube. Then if your tube freezes you can still drink your water. You can also use the bottle for hot tea in the morning when you backpack. For desert hiking I simply do not trust a bladder. On Amazon you can find a lot of different bottle tubes.
i took a couple pictures while we were out this last week end. my pack has side pockets at an angle that make it very easy to take out a water bottle and put it back in. it changed how i hydrate.
