Storage & Containers

Glass Preserving Jar (Barattolo)

Sealable glass jar for canning preserves, pickles, sauces, and spices.

A glass jar with a sealing lid used for canning and storing preserves, pickles, sauces, jams, and dry spices. With a two-piece or clamp lid it forms an airtight vacuum seal during water-bath canning for shelf-stable storage. Reusable and inert, jars are also everyday vessels for spice and pantry organization.

A glass preserving jar — barattolo di vetro in Italian, Mason jar (most often sold under Ball or Kerr) in American English — is a thick-walled, tempered soda-lime or borosilicate vessel engineered to survive repeated cycles of heat processing and to form an airtight seal on cooling. Unlike a simple storage jar, it is built to do two distinct jobs at once: hold food while it is boiled or pressure-canned, and then hold that same food in vacuum-sealed darkness for a year or more. The thickness of the glass, the flat machined rim, and the matched closure system are what separate a true preserving jar from a recycled pasta-sauce bottle, which is not tempered for thermal shock and will crack in the canner.

The closure is the most variable feature and the one a cook chooses deliberately. Anglo-American Mason-type jars use a two-piece metal lid — a flat sealing disc that seats against the rim and a screw band that holds it down; the disc vacuums onto the glass during cooling and is single-use, while the band is reused indefinitely. Continental European bail and clip systems (Weck, Le Parfait, Fido) use a reusable rubber gasket held by a wire bail or stainless clips against a glass lid. The Italian Quattro Stagioni keeps the Anglo-American two-piece metal lid format, in a decorative gingham-print body. Bail-closure jars also release gas during active fermentation, which is why sauerkraut and kimchi makers prefer them.

For the Italian cook, the barattolo is more than a container — it is the unit of currency of the autumn stagione delle conserve, when tomatoes are bottled as passata, peppers and aubergines are layered under oil as sottoli, cauliflowers and cucumbers become sottaceti, and mostarda and fruit confit are jarred against the winter. Keeping a working set of jars in three or four sizes (250 ml, 500 ml, 750 ml, 1 L) covers nearly every home preserving job.

Alternatives

Glass BottlePlastic Deli ContainerCeramic Crock

Types & varieties

Mason jar (Ball, Kerr)

American standard with two-piece metal lid in regular and wide-mouth; the workhorse of US home canning

Le Parfait

French hinged-bail jar with glass lid and orange rubber gasket; reusable seal, favored for ferments and pâtés

Weck jar

German jar with separate glass lid, rubber sealing ring, and stainless clips; the classic European preserving look

Fido (Bormioli Rocco)

Italian bail-closure jar central to home conserva, sottoli, and sottaceti

Kilner

British brand offering both screw-band and clip-top styles across the UK and Commonwealth markets

Quattro Stagioni (Bormioli)

Iconic Italian patterned jar with gingham-printed sides and a two-piece metal lid; visual shorthand for homemade preserves

Atlas E-Z Seal

Vintage American jar (1920s–60s) with glass lid, rubber ring, and wire clamp; still functional and widely collected

Tapered hex / hexagon jar

Decorative shape often used for honey, mustards, and gift preserves; not always rated for canning heat cycles

Wide-mouth jar

~86 mm opening versions of Mason and Weck lines, used for whole fruits, asparagus spears, and easy pouring

Choosing a closure system

The three families of closure behave differently and suit different jobs. Two-piece metal lids (Ball, Kerr, Quattro Stagioni) are the most forgiving for beginners because the screw band is easy to handle and the audible 'ping' of the sealed disc confirms success — but the disc is single-use, so ongoing cost is real. Bail-closure jars (Le Parfait, Fido) reseal with a rubber gasket that is checked and replaced every two to three years; they also burp naturally during active fermentation, which is why sauerkraut and kimchi makers prefer them. Weck jars with stainless clips have the most reliable visual seal — you can watch the lid pull down as the jar cools — and the rubber ring is reused, but the clips require a firmer hand and the glass lids are unforgiving if dropped.

Two-piece metal: cheapest per jar, single-use disc, easiest for water-bath canning of jams and tomatoes
Bail closure (Le Parfait, Fido): reusable gasket, ideal for ferments and pâtés, traditional French and Italian choice
Weck clip-top: reusable ring, visible seal, classic German look, the most expensive option
Glass lids (Weck, Atlas) chip if dropped — handle over a padded surface and never stack loosely

Headspace, rim, and the rules of filling

More preserves fail because of headspace than for any other reason. The space between the food and the lid must be matched to the food: jams and jellies need only about 5 mm because they expand little, fruits in syrup around 10 mm, tomatoes and pickles around 10–15 mm, and low-acid pressure-canned vegetables and meats need 20–25 mm to allow for expansion during processing and to draw a proper vacuum on cooling. Overfill and the seal never forms as food pushes against the disc; underfill and the jar may not seal at all. Equally important is the rim: wipe it with a clean damp cloth before applying the lid, because a single trace of sticky syrup or oil will break the vacuum.

~5 mm headspace: jams, jellies, marmalades, fruit butters
~10 mm headspace: fruits in syrup, chutneys
~10–15 mm: pickles, relishes, salsa, whole tomatoes
20–25 mm: low-acid pressure-canned vegetables, stocks, meats
Always wipe the rim with a damp cloth — syrup, oil, or seeds break the seal
Check the rim for nicks every time; even a hairline chip prevents a vacuum

Common uses

Water-bath canning of high-acid preserves: jams, jellies, marmalades, fruit syrups, chutneysPickling cucumbers, onions, cauliflower, and peppers in vinegar brinesLacto-fermenting sauerkraut, kimchi, giardiniera, and other live ferments in bail-type jars that release gasStoring dry goods: spices, dried beans, lentils, pasta, rice, granola, and nutsCanning whole tomatoes, passata, and pasta sauce with adequate acidificationPressure-canning vegetables, stocks, legumes, and meats in jars rated for pressure useDecanting and gifting preserves, honey, infused oils (cold only), and homemade liqueursServing individual portions of desserts, mousses, and parfaitsHolding brined or cured ingredients such as capers, olives, preserved lemons, and pickled garlic

Tips & pitfalls

Inspect the rim every time you reuse a jar — even a hairline chip prevents a vacuum and causes seal failure
Never reuse the flat metal sealing disc once a vacuum has formed; bands, bails, and gaskets can be reused after washing and drying
Keep jars hot (in simmering water or a warm oven) until filled to prevent cracking from thermal shock
Leave the correct headspace for the food — about 5 mm for jams, 10 mm for fruits in syrup, 20–25 mm for pressure-canned low-acid foods
Wipe the rim with a clean damp cloth before applying the lid — sticky residue breaks the seal
For bail jars, check the rubber gasket for brittleness and replace every 2–3 years for reliable sealing
Don't overtighten screw bands — fingertip-tight allows air to escape during processing, which is essential for vacuum formation
Allow jars to cool undisturbed for 12–24 hours; pressing the centre of a sealed two-piece lid should show no flex
Label with date and contents; rotate stock oldest-first — most preserves are best within 12–18 months
Don't use commercial pasta-sauce or jam jars for canning — their glass is not tempered for repeated heat processing

Good to know

Material: Soda-lime or borosilicate glass, food-grade and tempered for canning heat cycles
Typical capacities: 125 ml (4 oz), 250 ml (½ pint), 500 ml (1 pint), 750 ml, 1 L (quart); jars up to 2 L exist for pressure canning
Closure types: Two-piece metal lid (Mason-style, including Quattro Stagioni), wire-bail with rubber gasket (Le Parfait, Fido), or glass lid with rubber ring and stainless clips (Weck)
Heat tolerance: Tempered for thermal-shock gradients of roughly 40 °C; not for stovetop or oven dry heat unless specifically labeled
Lid lifespan: Flat sealing discs are single-use once a vacuum forms; screw bands, bails, and rubber gaskets are reusable
Reusability: Jar bodies are reusable indefinitely provided the rim is free of nicks and cracks
Sterilization: Boil 10 minutes, run through a dishwasher sanitize cycle, or heat in a 160 °C oven for 15 minutes dry
Compatible methods: Water-bath canning for high-acid foods; pressure canning for low-acid foods, with jars rated for pressure use