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2-6 Tubes

A fiberboard tube or similar long container is acceptable for mailing items if the tube length does not exceed 10 times the girth (the distance around the thickest part of the container). As a minimum, the strength of the tube ends must equal the tube sidewall strength, unless the contents are lightweight rolled items such as maps or blueprints. In any case, the sidewall strength must equal the thickness of the fiberboard, as shown in Exhibit 2-6.

Crimped or taped-end closures are not acceptable for mailing items other than lightweight rolled material. Tape must completely encircle the seams on friction slide closures of mailing tubes.

Exhibit 2-6

Tube Length (in.) Sidewall Thickness (in.)
Less than 18 1/16 (0.0625)
18 to 32 3/32 (0.09375)
More than 32 5/32 (0.15625)
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