The mid-Atlantic states are far from the coldest area around- I grew up in places with more serious winters.. but, yes, I do make some changes with the season.<br><br>I don't really change what's in any of the mini-kits. I keep some "Grabber Mycoal" chemical heating pads in the vehicle kit year round. I favor those rated for longer life at lower heat. They need to be renewed every couple of years. In the fall I usually shove a couple in my commuting shoulder pouch as well.<br><br>The shoulder pouch also carries a fleece cap and neck gaitor. Sometimes I take them out in the summer, sometimes I forget- they weigh almost nothing, so it's just a little extra padding. I also take more care to be sure that I have spare cell phone batteries in the pouch and that they're charged.<br><br>As the season progresses and the weather starts looking dubious, I throw a large down parka with hood, goretex gloves, Sorel Canadian boots with vibram soles, and a collapseable snow shovel in the back of the 4Runner (the vehicle kit has a Gerber/Fiskars tri-fold as well). When the forecast is for serious snow, I unhook a couple of down sleeping bags in their storage bags from the wall of the garage and throw one in the back of each vehicle. The vehicle also contains a handheld CB radio with car-plug adapter and lots of spare batteries, car-plug adapter for our cell phones, and those sealed liquid-fuel emergency-light lamps you see from time to time. No open flame is particularly safe in a vehicle, but these last a long time, won't spill, don't set the carpet on fire if they do burn down, and put out enough heat to make a difference in a vehicle.<br><br>If the forecast is serious cold, I take the water bottles out of the vehicle. I hate to do it, but I haven't found that a plastic-clad block of ice is particularly useful for either dehydration or hypothermia, and I'm always worried that they'll split.<br>