My pack is a Tenzig 2220. The bladder is against your back, save for the padding.
It cools while sitting, or overnight when camping, but I'm wondering if it's body heat when moving that makes it so bad.
When it starts freezing I use a Nalgene hdpe bottle. It sweats some, but will tolerate freezing better.
Like the bread sack idea. Just seems like stupid problem to cause yourself.
“You never need fear a man, no matter what his size. When danger threatens, call on me, and I will equalize.”
Samuel Colt.
�Common sense is genius dressed up in work clothes.� - Ralph Waldo Emerson
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