He drilled a hole in the power pack, which is supposed to be sealed off.
He unhooked the cables and took the power pack from his back.
This is the power pack, which is plugged into the headband, thus.
In his hands, he held one of the headbands and a power pack.
He started back, but Scotty came to meet him, carrying the camera and power pack.
They came to find him looking meditatively at the power pack from one of the flying suits he had designed.
Arcot cocked an eye at the power pack, visualizing the circuits.
Scotty took the power pack on his own lap and checked again to see that the dynamo-driven spring was wound tight.
There was a power pack, consisting of batteries and a dynamotor, an amplifier, and a control panel.
The power pack was held tightly between his knees, and his right hand was on the winding handle.