38mm closures mate directly with glass containers featuring a standard 38/400 GPI threaded neck finish. These caps provide airtight seals across mid-sized concentrate containers, extract bottles, and flower jars.

To source compatible glass bodies, explore our dedicated 38mm 38/400 Glass Jars Collection, and verify neck finish specifications against technical tables inside each product listing.

• Induction Foil Liners: Thermal-sealed aluminum barriers that prevent volatile terpene loss and stop fluid leaks.
• PE & Teflon Liners: Chemical-resistant polymer backings engineered for high-purity concentrates and solvent extracts.
• Pressure Seal Liners: Torque-activated adhesive seals that bond directly to glass rims upon initial closure application.

PTFE Teflon liners create an inert chemical barrier that prevents solvent-rich extracts and terpene fractions from breaking down cap materials. Non-reactive Teflon backings eliminate product contamination and seal degradation during long-term storage.

For specialized custom labeling or branding requirements, review options in our Custom Branding Services Menu.

Yes, 38/400 child-resistant caps feature push-and-turn locking mechanisms that comply with statutory state dispensary laws. Dual-motion inner and outer cap designs require downward force combined with counter-clockwise rotation to unseat closures.

Review state-specific retail closure mandates using our State Compliance Regulations Guide.

Inventory ships directly from our Sacramento warehouse so clients can access single units, standard split packs, or master wholesale cases without minimum constraints. Direct regional dispatch eliminates long factory lead times and keeps commercial packaging lines operating continuously.