The two best-selling Multi-Tools currently are the RIS Aluminum Carabiner Keychain Positron Screwgate Carabiner Camp Hiking Silver (EXPORT), 304 Stainless Steel M3.5 Link Chain Carabiner Set of 5 Silver and Rainbow Nice Color Screw Lock Bottle Hook Buckle Hanging Padlock Key Chain Aluminum Alloy Carabiner Set of 2. The most popular Multi-Tools are from Black Diamond, Blue lans and DHS. Multi-Tools from these brands usually cost about S$ 4.00 to S$ 66.00. Depending on your needs, you can get Binoculars, Trekking Poles and Fire Starters. Most Multi-Tools used today are in Silver, Green and Blue. Up to 71% discounts on Multi-Tools can be found only on iprice.