The suitcase was only used for scripted sequences. It can be spawned by typing
give_weapon_citizensuitcase into the console. Once the player has the suitcase it uses the world model instead of a view model. Pressing both right and left mouse does absolutely nothing.
The suitcase replaces the inventory position of the MP5K and uses its beta HUD icon. Once spawned, the player can only use that weapon, if another weapon were to be spawned, going back to the suitcase would remove the last spawned weapon.
- Half-Life 2 (First appearance)