Here is my experience.
I used a insulated Camelback.
-The motion from walking can help prevent the water from freezing.
-The tube will freeze if you dont blow any water back into the resevoir.
-If you load it with hot water (to extend the time until freezing occurs) the hose will get soft and fall off the nipple at the bottom of the bladder. Water will flood the insulation, and you probably wont find out until you are thirsty.
-Once water in the bladder freezes in the field you have to boil water (for sterilization) and pour it into the resevoir. Refer to the above effect.
-Even if you only need to refill a bladder which is not frozen, hot water will loosen that hose. So you have to spend more time letting the water cool before you put it in the resevoir.
Bottles will also freeze. If you carry them upside down, the cap area will freeze last, making it easier to melt ice in the bottle.
I used a insulated Camelback.
-The motion from walking can help prevent the water from freezing.
-The tube will freeze if you dont blow any water back into the resevoir.
-If you load it with hot water (to extend the time until freezing occurs) the hose will get soft and fall off the nipple at the bottom of the bladder. Water will flood the insulation, and you probably wont find out until you are thirsty.
-Once water in the bladder freezes in the field you have to boil water (for sterilization) and pour it into the resevoir. Refer to the above effect.
-Even if you only need to refill a bladder which is not frozen, hot water will loosen that hose. So you have to spend more time letting the water cool before you put it in the resevoir.
Bottles will also freeze. If you carry them upside down, the cap area will freeze last, making it easier to melt ice in the bottle.