- Bell Incorporated
- Caraustar
- Graphic Packaging International LLC
- Greif
- Huhtamaki
- International Paper
- ITC Limited
- METS? BOARD
- Mondi
- NIPPON PAPER INDUSTRIES CO. LTD
- Packaging Corporation of America
- Smurfit Kappa
- Sonoco Products Company
- U.S. Corrugated Inc.
- Visy
- WestRock Company