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(1)Every item of letter mail shall be securely wrapped with sufficient cushioning and reinforcing material as required to prevent loss of or damage to the item, damage to postal equipment or other mail and injury to persons handling the item.
(2)Every envelope or self-mailer shall be sealed except an item of letter mail that exceeds 245 mm in length, 156 mm in width or 5 mm in thickness or that weighs more than 50 g.
Federal laws of Canada reproduced under the Reproduction of Federal Law Order (SI/97-5); not the official version. Source: Justice Laws Website.