RC-3 has one of the most versatile sheath systems available. In fact given the RC-3 is an improved version over the original RAT-3 made by Ontario, it is safe to say that most of the investment in research and design for the RC-3 went into upgrading and developing the highly versatile sheath system.
I suggest getting the molle backing option with your knife for the extra $20 to increase versatility further. You don't have to use the molle backing in other configurations, but having it lets you alter and carry the knife in different types of configurations.
The sheath is ambidextrous and can be configured for either horizontal or vertical carry. You do this by threading paracord to form paracord loops. Some people are skeptical of the paracord loops, but they work extremely well, hold the knife tighter to your body than a tek-lok and if you just want to slip the sheath in your pocket the loops don't contribute to extra bulk like a devoted belt loop will. If you like tek-locks, you can purchase an aftermarket tek-lock and it will fit your RC-3.
The RC-3 also comes with a boot clip plate that you can screw onto the sheath. You can use the clip for pocket carry like you would a folded knife or boot carry. Finally, it comes with molle locks for fixing the blade to molle webbing found on military bags like maxpedition or military vests. The molle locks are included with the regular sheath package.
The molle backing option with the RC-3 allows you to carry the knife in a drop down orientation so that the handle sits below the belt. This is particularly good when carrying the knife on belt and using a backpack with a thick waist strap. The molle backing also offers additional lashing options and some neat retention features like a piece of shock chord/band that can flip over the top of the pommel for extra security making it "jump proof".
Anyhow, the RC-3 is a great blade.
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