Canon L90 - Manual (Page 157)

Maintenance
7-20
Option A-2: Multiple Box Return
We encourage you to use this option as a more efficient way to ship cartridges.
Complete Option A-1.
Bundle multiple cartridge boxes together securely with tape.
Please be sure that the shipment does not exceed UPS specifications.
Maximum weight = 70 lb. (31.8 kg)
Maximum length = 108 in. (2,743 mm)
Maximum girth (length + 2 x width + 2 x height) = 130 in. (3,302 mm)
If your shipment exceeds the above limits, please call 1-800-OK-Canon for special
shipping information.
Please Note:
Do not send defective cartridges for replacement.
Defective cartridges under warranty should be exchanged by an authorized dealer or
service facility as provided in the warranty.