Ok looking for help onthis one. I keep a pack in my vehicle and 1 in the wifes for just in case scenarios. Part of the kit is 2 1 liter bottles of water. Problem is this time of year they freeze. For me its not a big deal to bring pack in everynight. But for wife its hard to grab the bag everytime she goes in and out of house with 2 little ones. Anyone have any ideas for material to wrap them with or a way to keep them from freezing completely?