Chartpak telescoping document tube, charltube, 28″-43″ long x 3.5″ diameter, black telescoping document tube offers a lightproof plastic to protect materials against fading from exposure to sunlight, and from bending or creasing. Length is adjustable from 26″ to 43-3/8″ in 24 locking 3/4″ increments. Water-resistant document tube includes a shoulder strap and is not recommended as a mailing tube.