This box is too bulky to carry.

It's made not of a bulky tube, but of a thin layer of a semiconductor material that serves as the gamma detector.

But the problem was that the gamma detectors were these huge, bulky tubes, and they were filled with these scintillating crystals, and you just couldn't get them close enough around the breast to find small tumors.

The fire suits of old, the bulky suits, the thick woolen suits, have been replaced with modern materials like Nomex or, more recently, Carbonex fantastic materials that enable us as stunt professionals to burn for longer, look more spectacular, and in pure safety.