Discussion: About water.

Do you use a bladder? If yes, put it to the race face vest, and vest is the next layer after under skirt - in top the next layer + jacket. The hose needs to be inside of the jacked, and keep the mouth part well protected & covered from the wind - also you need empty the hose, just blow air in it so the water will be at bladder. It might be also worth testing to put the warmer next to bladder, it would increase the duration.