The Leatherman Squirt P4 tool is a retired, very compact multi-tool that will fit comfortably in your pocket. It contains a pair of pliers, plus a variety of other useful implements (six altogether, 3 tucked into each arm of the pliers). This model was introduced in 2002, and retired in 2010. During its tenure the P4 was very popular. Some people consider it to be superior in quality to the Squirt PS4 that replaced it.
There are no similar tools from Victorinox or Wenger.