The gloves, coveralls, hat and boots will come in handy if you need to change a tire or decide to walk for help. The salt should be in a container that won't leak salt inside your car because it is corrosive. If you find yourself stuck against the curb and can't back out, a handful of salt behind each drive wheel will get you moving. Tow ropes used to be handy when cars got stuck and there was something to hook onto, but the new cars don't have a good place to hook up. You could have a mechanic bolt some hooks to the car that would serve that purpose.
Most women carry nearly that much in their purse.
Should you find yourself stuck in cold weather the recommendation is stay in the car and keep warm while you wait for help. Raising the hood is the recognized HELP signal. However, as I mentioned earlier, it may be a long wait, so please keep a sleeping bag and some candy bars in your car. People freeze to death every year trying to walk for help in cold weather. The human body simply cannot generate enough heat to stay ahead of the losses.