Protecting over-the-counter (OTC) and nutraceutical products requires packaging that balances safety, performance, and sustainability. CSI developed Defender-Lok™, a next-generation child-resistant closure (CRC) engineered to deliver on all three.
Child-Resistant and Senior-Friendly
Defender-Lok is certified child-resistant and senior-friendly, giving manufacturers confidence in meeting regulatory requirements while ensuring easy access for adult consumers. Available in 33mm, 38mm, 45mm, and 53mm diameters, the line supports dry and liquid products with flexibility across liner types including foam, tri-foil, induction, pressure-sensitive, and custom options.
Drop-In Ready for High-Speed Lines
Engineered for efficiency, Defender-Lok integrates seamlessly into existing capping and filling lines. The design reduces feeder jams, sealing failures, and downtime—helping brands maintain speed and reliability without costly operational changes.
Sustainable by Design
Sustainability is built into every Defender-Lok closure. Up to 33% lighter than traditional CRCs, these closures reduce resin use and shipping weight. Defender-Lok can also be manufactured with PolyCycle™ PCR resin, CSI’s post-consumer recycled material that is both 100% recyclable and designed to meet Extended Producer Responsibility (EPR) requirements.
Proven Expertise and Global Scale
With more than 90 years of packaging innovation and nine manufacturing facilities worldwide, CSI brings unmatched scale and technical expertise to every CRC we produce. Defender-Lok is manufactured in FSSC-22000 certified facilities, supported by in-house R&D and tooling. CSI customers also benefit from on-site technical service, line audits, and commercialization support to ensure smooth integration.
Why Choose Defender-Lok?
- Certified child-resistant and senior-friendly design
- Drop-in compatibility with OTC and nutraceutical lines
- High-speed performance to reduce errors and increase yield
- Tamper-evident and liner agnostic flexibility
- Lightweighted design supporting sustainability and EPR goals
- Available in PolyCycle® resin to maximize sustainability
Defend product integrity. Lok in performance.
Learn more at csiclosures.com/defender-lok
Q: What makes Defender-Lok™ different from traditional child-resistant closures (CRCs)?
A: Defender-Lok is engineered to be up to 33% lighter, fully child-resistant, and senior-friendly. It combines safety, sustainability, and high-speed line compatibility, making it more efficient than older CRC designs.
Q: Is Defender-Lok™ certified for child resistance and senior accessibility?
A: Yes. Defender-Lok meets regulatory requirements for child resistance while remaining senior-friendly, ensuring products are safe from children but still easy for adults to open.
Q: What packaging applications can Defender-Lok™ support?
A: Defender-Lok is designed for OTC and nutraceutical products, both dry and liquid, with liner flexibility including foam, tri-foil, induction, pressure-sensitive, and custom options.
Q: Can Defender-Lok™ integrate into existing filling and capping lines?
A: Yes. Defender-Lok is drop-in ready for high-speed production lines, helping reduce feeder jams, sealing failures, and downtime without requiring major operational changes.
Q: How does Defender-Lok™ support sustainability goals?
A: Defender-Lok reduces resin use and shipping weight by being lightweight, and it can be manufactured with CSI’s PolyCycle® PCR resin, a 100% recyclable post-consumer recycled material that helps meet Extended Producer Responsibility (EPR) requirements.
Q: What sizes are available for Defender-Lok™ closures?
A: Defender-Lok is available in 33mm, 38mm, 45mm, and 53mm diameters, providing flexibility across a wide range of OTC and nutraceutical products.
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