Defender-Lok™

Next-generation CRC performance for OTC and nutraceutical brands.

Defend Product Integrity – Lok In Performance

Defender-Lok™ is a child-resistant, senior-friendly closure line designed for OTC and nutraceutical packaging that offers drop-in compatibility, high-speed performance, and lightweight, sustainable design.

Watch Defender–Lok™ in Action

Do more with less. Because getting it right—for your product and your customers—matters.

Built for Your Line. Ready for Your Market.

Drop-In Ready

Defender-Lok™ integrates directly into existing capping and filling lines, reducing downtime and implementation costs. It also reduces feeder jams and sealing failures—streamlining line performance.

Certified Child-Resistant + Senior-Friendly

Engineered for compliance and accessibility. Defender-Lok™ is suitable for all age groups.

High-Speed Scalable

Optimized for OTC and nutraceutical lines being ran at varying speeds. Maintains line speed, reduces errors, and increases yield.

Lightweighted for Sustainability

The lightest-in-class design reduces resin use and shipping costs, supporting new EPR regulation goals. Verified via Life Cycle Analysis (LCA). Optional PolyCycle® PCR content offers added sustainability without compromising quality.

Tamper-Evident & Liner Agnostic

Supports a range of liner options (foam, tri-foil, induction, pressure-sensitive) and tamper-evident configurations.

You get efficiency without compromise—because production reliability protects both operations and customers.

Helping you meet critical safety requirements while respecting end-user needs.

Built to keep pace with your growth.

Efficient for your business. Smarter for your supply chain.

Ready for every product, every market, every time.

Drop-In Ready

Defender-Lok™ integrates directly into existing capping and filling lines, reducing downtime and implementation costs. It also reduces feeder jams and sealing failures—streamlining line performance.

You get efficiency without compromise—because production reliability protects both operations and customers.

Certified Child-Resistant + Senior-Friendly

Engineered for compliance and accessibility. Defender-Lok™ is suitable for all age groups.

Helping you meet critical safety requirements while respecting end-user needs.

High-Speed Scalable

Optimized for OTC and nutraceutical lines being ran at varying speeds. Maintains line speed, reduces errors, and increases yield.

Built to keep pace with your growth.

Lightweighted for Sustainability

The lightest-in-class design reduces resin use and shipping costs, supporting new EPR regulation goals. Verified via Life Cycle Analysis (LCA). Optional PolyCycle® PCR content offers added sustainability without compromising quality.

Efficient for your business. Smarter for your supply chain.

Tamper-Evident & Liner Agnostic

Supports a range of liner options (foam, tri-foil, induction, pressure-sensitive) and tamper-evident configurations.

Ready for every product, every market, every time

Technical Snapshot

Available Stock Sizes	Liner Options	Application
33mm 38mm 45mm 53mm	Custom Foam Tri-Foil Induction Seal Pressure-Sensitive	Drop-in ready for OTC/Nutraceutical packaging lines Suitable for dry and liquid products

“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.”

— Chuck Newswanger, Director, Global Commercial Innovation and Technical Development-Pharmaceutical Packaging, Closure Systems International (CSI)

Defender-Lok™: When you think CRC – think CSI

Proven Scale. Global Trust.

Trusted by leading OTC and wellness brands for over 90 years, CSI operates nine manufacturing sites across the U.S. Mexico, Costa Rica, China, and Japan.

Certified Precision. Built for Demanding Requirements.

Clean-room capable with in-house tooling and FSSC-22000 certified manufacturing.

Application Support + Validation

CSI experts provide on-site technical service, line audits, and commercialization support—from spec alignment to validation runs. We know your validation process matters—and intentionally support it.

Continuous Innovation

In-house R&D, certified labs, and dedicated CRC development ensure Defender-Lok™ outperforms legacy designs and meets evolving regulatory standards.

Sustainable CRC Options

CSI’s Defender-Lok™ CRC product line can be made of PolyCycle PCR resin—produced from recycled content and fully recyclable. Defender-Lok™ closures made with PolyCycle PCR support sustainable packaging goals without sacrificing compliance, high-speed, or the high-quality standards your lines demand.

Contact our team to explore PolyCycle solutions for your next CRC application.

Meet Us at NACDS | August 23–25

TOTAL STORE EXPO | SAN DIEGO CA

Contact Us

Looking to upgrade your CRC closures without disrupting production?

Contact our CRC team. We’re here to support your packaging goals, operations, and, ultimately, the customers who count on your product.