Medium Swiss Army Knives are the bestselling Victorinox multi-tools, with the most popular size being 91 mm (3.50 in). These medium-sized tools pack in as many as 73 functions (the SwissChamp XXL). If you're looking for something more compact, however, the Spartan and Tinker both have 12 functions.

The 91mm (3.5 inch) Swiss Army Knife is the most popular size. The 91 mm refers to the length of the handles of the knife from end-to-end with all of the tools closed. While red celidor is the most iconic of Swiss Army Knife handle, the 91mm pocket tools come in a variety of celidor colors, as well as alox (aluminum oxide) and hardwood.