an elongated cylinder of cardboard, used for mailing rolled-up papers, magazines, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for mailing tube
Historical Examples of mailing tube
In his hand he carried what looked like a small club, but proved on closer examination to be a mailing-tube.Sube Cane
Edward Bellamy Partridge