Since a tool bag is usually made of flexible materials in different shapes, it has 1 or 2 handles or a carrying handle. It can be worn around the waist with a belt and has as many inside units as you wish. A tool case, on the other hand, usually consists of 2 parts. As a robust container with a resealable lid, it often has various units for different types of tools. One or more handles make it easy to carry or pull. Almost all tool cases can be locked with a lock (combination lock or key).