Rainier Partners, a private equity firm, completed the acquisition of Calpine Containers, which distributes innovative and quality packaging. Financial terms were not disclosed. “Calpine has a well-earned reputation as a dependable partner to its customers. We are thrilled Calpine has chosen to partner with us and look forward to supporting management as Calpine extends its 125-year history,” Jon Altman, Rainier Managing Partner.