In my opinion, a multi tool must have multiple tools. Multiple functions help but dont make somthing a multi tool. I tend to lean toward 5 as a number that best describes a multi tool. Pliers, blade, 2 screwdrivers, can opener, etc constitutes a multi tool. But pay attention to Pliers. Pliers make a multi tool. Other than that you have a SAK. Still multiple functions but without pliers I dont think it is a multi tool. However, Pliers are available on some SAKs. This is a case of what came first chicken or egg?