We are a custom manufacturer of envelopes for the direct mail industry. By embracing and investing in new technology, we reinforce our commitment to providing our customers with the best quality and value. Our capabilities provide solutions to your most demanding projects; we print high-quality Flexo CI, convert high speed Web and computerized Die-Cut, as well as quality Lithography. By combining a wide range of materials, formats and best-in-class equipment to fit your every need, we help you communicate your message, manage your budgets and meet your deadlines - your trust is our most important asset, and we work hard every day to earn it. Our dedication to sustainability begins with our choices in paper, power, and waste processes, which minimizes the impact of our operation on the environment.

Your Partner in Mailing and Packaging Solutions since 1930. Back in 1930, Calumet Carton was created as a small, family-owned manufacturer of folding cartons and rigid mailing envelopes to Chicago area companies. 80 years and four generations later, Calumet is still owned by the Inwood family, but has grown into the leading producer of mailers and packaging products, serving customers from coast to coast. Our stock line include the nationally known Stayflats® and Stayflats Plus® brand of rigid mailing envelopes, Stayflats Lite™ and Stayflats Utility™ lightweight rigid mailers, Expand-A-Mailer™ gusset envelopes and ConfirMailers™, Delivery and Signature Confirmation Mailing Boxes for USPS First- Class Mail® . The stock line also includes 42 sizes of Kraft reverse tuck folding cartons and white reverse tuck folding cartons. Calumet Carton is also a full service folding carton manufacturer. We specialize in designing and producing custom packaging to your exact specifications. This includes custom designed and printed folding cartons, mailers, point of purchase displays and small flute corrugated boxes. Calumet Carton is based in South Holland, Illinois located approximately 30 minutes south of Chicago.

Daubert Cromwell is a global manufacturer of corrosion inhibitor (VCI) packaging products used by customers in Metalworking & Fabricating, Heavy Equipment, Automotive, Electronics, Aviation/Aerospace, Military, Renewable Energy, Oil & Gas, Shipping/Export and other industries where corrosion prevention is critical. Since 1948, quality manufacturers have trusted Daubert Cromwell to protect valuable metals during all stages of production, storage and shipment. Daubert Cromwell, an ISO 9001:2015 company, operates from a state-of-the art facility in suburban Chicago. This corporate center is headquarters for manufacturing, shipping, sales/marketing management, customer service support and technical functions. The company has subsidiaries in Europe, China and Mexico, and a global sales team coordinating customer requirements in Japan, India, Southeast Asia, Australia, and South America.

Wertheimer Box Corp. is one of Chicago's largest, independently-owned corrugated packaging companies and corrugated display stand manufacturers. We also provide WEcommerce Packaging Solutions™ and inside-outside printing of logos and other brand designs and messages. Our 303,000-square-foot plant operates 20 hours a day. At Wertheimer Box, we stand behind you. We know that your brand, product, or company success and profitability are our success. We’ve got your back.

Diamond Envelope Corporation is a family entrepreneurial business manufacturing and coordinating direct mail marketing products. Our main focus and operation is envelope manufacturing with value added services available. Diamond Envelope’s mission is servicing our customer’s needs by being the best at delivering a high quality product on time, while meeting all of our customer’s expectations. We are always up for a new challenge. With our people, staff, equipment, knowledge and facility, we embark on new product lines to grow and differentiate for the future. Contact us with your new project idea today and we hope to fulfill whatever your need is!