Tool bags are useful when you do a lot of jobs in different locations. You can easily take your tools with you in, for example, a backpack or shoulder bag. In addition, the bags are often made to withstand the conditions. They're waterproof, made of sturdy material with strong zippers, and equipped with many small and lockable compartments. Some tool bags are very specifically aimed at a certain type of handyman and the tools they need. For example, a carpenter or plumber.