Contraband vessel: The padded envelope
One of the difficulties in controlling contraband lies in discovering specific unusual uses of everyday items. For example, the padded envelope is designed to protect fragile items in the mail. However, with a little help from outside sources, offenders can have a variety of illegal goods and dangerous items mailed in using the common padded envelope.
Here's pictured a run-of-the-mill padded envelope. To most, it does not look sinister. Yet, this is an effective contraband vessel.
With a little well-placed tape or glue, narcotics of any variety can be placed in the seam. Because of the padding, the drug is not easy to detect.