Closure Systems International Launches Defender-Lok™ CRC Product Line

Lightweight. Drop-in. Scalable. Sustainable.

Closure Systems International (CSI), a global leader in closure design and manufacturing, announces the launch of its new child-resistant closure (CRC) platform: Defender-Lok™. Engineered for OTC and nutraceutical applications, Defender-Lok delivers certified safety, operational efficiency, and sustainability in a drop-in, high-performance solution.

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CSI's new Defender-Lok CRC closure design.

Built for Line Efficiency and Compliance

Defender-Lok is designed to integrate seamlessly into existing capping and filling lines—minimizing downtime, feeder jams, and sealing failures. The result: optimized production, simplified validation, and consistent throughput. The closures are certified child-resistant and senior-friendly, offering peace of mind to both manufacturers and consumers.

“In the OTC and nutraceutical market, child-resistant closures demonstrate a brand’s commitment to consumer safety and regulatory compliance. A well-engineered design meets the expectations of today’s health-conscious shoppers, ensures compliance, and integrates seamlessly with high-speed filling and capping lines,” said Chuck Newswanger, Director, Global Commercial Innovation and Technical Development–Pharmaceutical Packaging at CSI.

Key features of Defender-Lok include:

• Certified CRC Design – Child-resistant and senior-friendly, meeting regulatory standards
• Drop-In Compatibility – Ready for existing OTC/nutraceutical lines
• Sustainable Engineering – Up to 33% lighter than conventional CRCs; supports PolyCycle™ PCR resin integration
• Tamper-Evident & Liner Agnostic – Compatible with all liners including foam, tri-foil, induction seal, pressure-sensitive, and custom
• High-Speed Performance – Maintains line speed, reduces errors, and improves yield
• Flexible Formats – Available in 33mm, 38mm, 45mm, and 53mm sizes; suitable for dry or liquid products

Sustainability by Design

With growing Extended Producer Responsibility (EPR) requirements and state-level mandates like California’s SB-54, sustainability is no longer optional. Defender-Lok is designed for material minimization—reducing resin use, shipping weight, and overall environmental impact. Select SKUs already exceed 2027 SB-54 targets, and all closures in the line can be produced using CSI’s PolyCycle™ PCR resin, which is made from post-consumer content and fully recyclable.

Backed by Global Scale and Technical Expertise

CSI brings more than 90 years of experience and operates nine manufacturing sites across the U.S., Mexico, Costa Rica, China, and Japan. All CRC products, including Defender-Lok, are manufactured in FSSC-22000 certified facilities with in-house tooling and R&D support. CSI also offers customers full application assistance, including on-site technical service, validation audits, and commercialization support.

Defend Product Integrity – Lok In Performance

To learn more about the Defender-Lok CRC line or to speak with CSI’s technical packaging team, visit: csiclosures.com/defender-lok

About Closure Systems International

Closure Systems International (CSI) is a global leader in closure design, manufacturing, and innovation. CSI supplies billions of closures annually across the beverage, food, household, and healthcare sectors. Learn more at csiclosures.com.

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