Cap & Closure
Types, Explained

The closure on a jar or bottle does more work than it gets credit for — it determines shelf life, whether a product needs pasteurisation compatibility, and how it behaves through your filling line. Here's how the main types differ.

Twist/Lug

The most widely used metal closure in food and beverage packaging, and for good reason: it offers an excellent oxygen barrier, handles hot and cold filling, and is compatible with pasteurisation and sterilisation processes. It comes in several depth profiles — Regular, Medium, Deep, and Deep-Deep — chosen based on the jar neck finish and fill requirements. If you're not sure where to start, Twist/Lug is the safest default for most sauces, preserves, and condiments.

Continuous Thread

An uninterrupted spiral thread, available in both tinplate and lightweight aluminium. It's easy to open and reclose, works with or without vacuum, and covers a wide diameter range. It's a good fit where repeated opening and closing matters to the end user — think condiments used daily rather than preserves opened once.

BRP (Vacuum Closure)

A press-on, twist-off vacuum closure known for its hygienic construction, often specified for premium food segments and baby food where exceptionally high standards apply. If your product category has strict safety expectations from consumers, BRP's vacuum-seal button gives an immediate, visible confirmation that the seal hasn't been broken.

Unishell®

This closure hides its threads inside the cap itself, giving a smooth, uninterrupted external finish. It's chosen more for shelf presentation than function — brands wanting a premium look with full decoration flexibility often prefer it over a visibly threaded closure.

Classic Canner

A deep Twist/Lug variant engineered to function like a Continuous Thread closure, giving a traditional, home-preserved aesthetic. Common for jams, pickles, and artisanal products where the "classic canning" look is part of the brand story.

Matching closure to product

One practical note: whatever closure you're considering, confirm compatibility with your specific jar or bottle's neck finish before committing to packaging — mismatches between cap and container are one of the most common (and avoidable) production delays we see.

Unsure which closure fits your product and filling line? We can talk through the options against your specific requirements.

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