| Business | Phone |
| Black Diamond Packaging Inc 1630 Challenge Dr, Concord 94520 | (925) 825-0871 |
| Schermerhorn Brothers Co 2975 Treat Blvd # E8, Concord 94518 | (925) 686-4850 |
| Boxes For Moving & Storage 975 Detroit Ave # C, Concord 94518 | (925) 686-6204 |
| Pactiv Corp 1515 Lucky Dr, Concord 94519 | (925) 288-9322 |