Only tool I ever will need, a hammer. And, lucky for me my mom gave me a tiny one with a flowered handle for a birthday present when I was in college. As far as I am concerned anything problem I have that cannot be solved with this tool, so basically anything other than hanging a picture, is a job for my boyfriend. Something I know he appreciates because I can see it in the rolling of his eyes. However, for most people, at least anyone who is not as lazy as me, will find having tools around very useful, and for these rare people they will also find a tool case useful for containing them.
Tool cases are able to protect the tools inside them from rusting due to water exposure, getting lost or set in the wrong place, getting stolen by the dog and other possible damaging items. They provide protection from shock and vibration as well as the elements. This could include moisture, salt spray, dust and water exposure. These protections are necessary because in many of the industries tool cases are needed such as business, industrial settings, engineering and others, they can be subjected to various environmental conditions that could wear them down.
The amount of protection provided by these cases depends on the exact purpose. For home owners that are using them for maintenance around the house, the case does not need to be extremely durable. However, for a repair man where the box could be easily thrown around in the back of a truck or left outside in the rain, an extra durable case could be necessary. Ranging in size, shape and price ranges, the exact model for a tool case for each person will most often depend on their occupation and surroundings.