Being ready for a natural disaster is never a bad idea, especially given how unpredictable nature can be. For many people, the easiest way to prepare is simply purchasing a disaster survival kit for sale. Unfortunately, these kits are rarely one size fits all, so it's important that you know what to look for and how to judge the quality of the contents.
With the possible exception of food, the contents of any good disaster readiness kit should have more than one possible use. This helps to save on storage space, since it's easier to carry a large amount of one item than it is to carry several different things to fill multiple roles. Not all of the potential uses for some materials will be readily apparent, so if you're a novice make sure that there is documentation that outlines at least a few uses for things like mono-filament line, containers and any tools included.
Multi-purpose materials include things like reflective blankets, fishing line, thread or rope. Reflective blankets are designed for use in cold weather, and can be used for insulation, shelter and signaling devices. Cordage of any kind, such as fishing line and thread, can be used to mend clothing, suture wounds or secure structures.
While it's perfectly fine to buy an emergency kit that contains food, make sure you're focusing on those that rely on non-perishable items. Freeze-drying, dehydration and canning are all viable options, but only freeze-dried supplies will combine both portability and shelf-life. Dehydrated food can still spoil over time, especially if it isn't properly sealed, and canned goods add considerable weight, which can impede travel if you're unable to wait out a natural disaster inside your home.
Some materials also have a limited period of usefulness, such as thin plastics which degrade over time, and rubber seals which can dry out and become brittle. Avoid kits that rely on too many of these synthetic materials in the tools, equipment and supplies included inside. Foil containers and metal tools will have the best life expectancy and provide the best oxygen barriers for storage.
As with anything else you purchase, spend some time familiarizing yourself with the contents of any disaster kit you purchase. Make sure you know what tools you have, how strong they are and whether or not they need periodic maintenance to remain useful. If your kit does contain food make sure you know just how long it can be stored before it's no longer safe to consume. Getting this right can make a world of difference the next time nature throws you a curve ball.