Most of Iron Man's armors can collapse to where they can fit within his briefcase.
It contains a number of safety devices to prevent others from opening it and using the armor. It is able to analyze the fingerprints of anyone who touches it. It is usually set to accept only the fingerprints of Tony Stark, but he may program it to the prints of others if he so chooses. If the fingerprints do not match those which it is programmed to accept, then knockout gas may be emitted. If forcible entry is attempted, it will self-destruct, to destroy both it and the armor.
Another safety feature includes a security handcuff attached to the locking mechanism on the outer top side of the briefcase. The other end of the handcuff is secured about Tony Stark's wrist.
The briefcase is also outfitted with computerized components that enable him to link-up with alternate computer networks. In function, it is not dissimilar to a modern day USB flash drive. Tony once used his briefcase to hack into the mainframe computer aboard the SHIELD Helicarrier. .
Marvel Cinematic Universe (Earth-199999)
The briefcase armor hold the Iron Man Armor MK V for any unexpected scenarios. It is unveiled when opened and is portable so it is possible to carry it around. The suitcase is red, but when fully deployed, silver is present within the structure. It looks quite similar to the Iron Man Armor MK III, the most common armor used by Tony Stark.
The briefcase is used in combat situations, that were unforeseen or unexpected. A modified design means efficiency is limited in sacrifice for maneuverability of the packed down briefcase. The suit carries very little armament due to weight and characteristic restrictions, but serves as a ready replacement when the Iron Man Armor is not available. .
Stark has also used a briefcase in this reality in a similar capacity. 
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- Appearances of Iron Man's Briefcase
- Images featuring Iron Man's Briefcase
- Item Gallery: Iron Man's Briefcase
- Fan-Art Gallery: Iron Man's Briefcase
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