mailing tube

In this case the test tube was plugged with cotton and inserted in a wooden mailing tube to exclude the light.

He found a mailing chute, and popped the mailing tube down the slot as if he were glad to be rid of it.

The illustrations show two methods of securing papers or photographs in a mailing tube.

In his hand he carried what looked like a small club, but proved on closer examination to be a mailing-tube.