Decepto-Pack
The Decepto-Pack is a backpack designed to be worn by humans. Upon activation it transforms into a full set of Decepticon combat armor for the wearer. The armor consists of a breast plate, belt, wristbands, Transformer helmet with faceplate, an arm shield, and pistol-style laser weapon. All pieces of the armor are visibly marked with the Decepticon symbol. The shield also bears the likeness of an unknown Decepticon warrior.
Fiction
Ask Vector Prime
With the success of the Autobots' S.T.A.R.S. program, the Decepticons of Primax 185.0 Beta responded with their own Decepto-Packs, enslaving humans to augment their capabilities and help them conquer the planet. Galvatron eventually provoked a nuclear strike that provided him the energon necessary to have his slaves build Zod drones, which he unleashed across the universe, conquering many systems. Ask Vector Prime, 2015/06/04
Toys
The Transformers
The Decepto-Pack was sold by HG Toys in 1985. It is the only actual transforming Transformers "costume" marketed to the public. Why they chose the Decepticons over the Autobots is unknown, except perhaps that bad guys are just cooler.
The Decepto-Pack was sold featuring either a cheerful blond boy in a yellow shirt, or a sullen brown-haired boy in an orange shirt. The box art differed completely between variants. Presumably, the brown-haired version came later, since it matches the live model.
