The Leatherman Style PS tool is a compact, keychain-sized multitool that is marketed as "airline-safe", since it has no knife blade. It is by far the smallest multi-tool with pliers.
Size & Weight: The Leatherman Style PS tool is 77mm (3") long, 20.7 (.8") wide, and 9.5mm (.4") thick. It weighs about 45.0 grams (1.6 oz).