Are envelopes used by a business considered to be a “package” under the law?
Yes. The definition of a package in the law under ASTM D-996 includes the term “envelope” (85a, page 222, ASTM D-996). This would include envelopes or shipping cartons supplied by Federal or Airborne Express, U.P.S. and others. It is recommended that users of such packaging ask their respective express carrier agencies for Certificates of Compliance.