Now I was wondering this, would a cooler help to protect Some of the more critical weather sensitive items? Walmart sells a cooler which is just the right size to fit into my Thule 1100, My real worry is water, I have been looking at different methods for storing water, and the best I think is either 2 liter bottles or using Hydration packs (I use platypus bags myself in my backpacks and the like). My worry is the water freezing and exploding whatever they are in.