This is what I carry for winter time.
1.Located in the passenger door storage compartment:
- two S.O.L emergency blankets
- one S.O.L Scout kit with Victorinox Dual Pro X added
2. Located on the driver door storage compartment:
- one S.O.L emergency bivvy
- one Adventure Medical Kits First Aid Family Medical Kit
3. Located in the back seat:
- one small fleecy throw
- one sportsman heat-a-seat
- one pair of mittens and a toque.
4. Located in the trunk area:
Inside a cooler are:
- large thick pic nic blanket
- wool blanket
- car emergency kit that contains flares, emergency signs, tire inflation, tire spanner, etc.
- small tool kit
- folding emergency shovel
- Supplemental survival kit that contains various types of hand/feet warmers, emergency flashlight/hand powered radio, candles, matches, chocolate bars/candies, mini stove/heater with fuel, water purification straw plus tablets, and two stainless cups
5. Located in the center console:
- extra tough flashlight with spare set of batteries
- a few pairs of hand warmers
I do not carry water as that would be problematic during our cold winter temperatures. To offset this, I always pack a few water bottles on any trip on the highway. If not, I figure snow with the water purification equipment/emergency stove will do in an emergency pinch. I also pack a rubber boot tray in the back. This prevents the cooler from sliding all over the place, but also can act as a traction device if my 4x4 somehow gets stuck.