Camille After reading about the spate of people stranded on snow-bound highways this winter (Virginia, Pakistan, Greece 7 Turkey) I found your post among many other great guides and built my own Car Bag. I found that a police style 37-liter duffle bag and milk crate handled the storage just fine. For the water storage, which is a tricky question, I found that The Mountain brand aluminum bottle resist bursting from freeze to -5F below. The rest of my items are in line with the kinds of recommendations you can find here. Very happy to have my kit deployed in the back of my gassed-up Subaru with more winter weather on the way. Thx David Store in Glovebox and/or Dashboard Well Emergency Phone Numbers for Auto Insurance/Local Tow Companies etc. Escape tool Small jackknife Flashlight (plus extra batteries) Headlamp (optional) (plus extra batteries) N95 Masks (5) Hand Sanitizer Lighter Chap Stick Small notebook Rain-proof pens Store in a Large Milk Crate Snow brush Snow shovel Extra Bottle of Windshield Fluid Large umbrella Flares or Reflective Triangles Basic Automotive Toolkit Box of Extra Fuses & Fuse puller Jumper Cables Portable Jump / Power Pack Water Store in a Medium Duffle bag Medium Duffle bag First Aid Kit Basic First Aid Manual Ice Packs (2) Emergency Ponchos (4) Emergency Blankets (at least 1) Emergency Wool Blanket (at least 1) Wool Beanies (at least 1) Work gloves (at least 1 pair) Multi-tool with a knife Paracord Roll Duct Tape Glow sticks (6) Emergency whistle N95 Masks (10) Safety Goggles (1) Wet Wipes Disposable Lighters (2) Hand Warmers (Disposable) Non-Perishable Snacks Phone charging cord Bandana Sharpies Rain-proof pens Contractor bags