The tube itself is a passive component consisting of either a simple reflective interior coating or a light conducting fiber optic bundle.

Kendi held up an arm and she landed, making a surprisingly light, feathery bundle.

Finding a large closet, The Shadow stowed his bag behind a high stack of light bundles.

Many of the lighter bundles and crates had either been burned up, or had floated loose and been lost.

Then he trotted gaily to the house, the hare following after with his lighter bundle.

The vergence (typical symbol: L) of a light bundle in optics is the reciprocal of the distance between the point of focus and a reference plane.

Kreft was carrying a long, light bundle.

Kenji and Kotaro just walked out the door, carrying everything they needed for the road in their hands: light bundles in wrapping cloths, a spare pair of sandals, some rice cakes flavored with salted plums.

He had only a light bundle, for he had lost his pack at Parth Galen, and all he had was a few useful things he had picked up among the wreckage of Isengard.