Trekker knives are large Swiss Army knives (4 3/8" / 111mm) from Victorinox. They contain similar tools to the Hiker, and are less pocket friendly but probably more useful on the trail (particularly the larger saw).

There are a host of different variations of the Trekker available (see below), all of which feature a locking blade with a "thumb release," which this knife does not have.

This model has also been called the Trailmaster knife.

One-Hand Trekker-- serrated blade, thumb release
One-Hand Trekker Non-Serrated-- thumb release
One-Hand Trekker Black Blade-- black serrated blade, thumb release
One-Hand Trekker German Army-- olive shells with imprinted logo, serrated blade, thumb release
One-Hand Trekker Camo-- camoflage pattern shells, serrated blade, thumb release
One-Hand Trekker Camo Non-Serrated-- camoflage pattern shells, thumb release

Centurion-- no wood saw
Forester-- corkscrew instead of phillips screwdriver
Hiker-- adds small blade, smaller knife (3 1/2 " / 91mm)
Rucksack-- smaller screwdriver, corkscrew instead of phillips screwdriver