Because so many of the unique features of these tools are patented, great ingenuity is needed to accomplish the same or similar results, with varying degrees of success. The Essential Differences Virtually all of the multi-purpose tools reviewed here are capable, well made, and would be an asset to a survivor. With such a huge variety of tools to select from, each with an assortment of often unique and intriguing features, it s important to identify what features are most important to you, then select the multi-purpose tool that includes those features. Some differences, however, go to the essence of the matter. The first criteria to consider is size.
Many manufacturers offer multiple sizes of their multi-tools.
These tools are large enough to be useful, but still small enough to fit comfortably in your pocket, being roughly the same size and not too much heavier than a larger multi-blade pocket knife. While convenient and of adequate size, these tools often lack some desirable safety and functional features. At the top of the multi-tool pyramid are the larger tools, with more desirable features, which are most comfortably carried in a belt sheath due to their size and weight. From both a functional and safety standpoint, a very desirable feature is locking blades and implements. This prevents the tool from accidentally folding while in use and injuring the user, as often happens otherwise.