Food Storage Containers

Weck 742 Mold Jar 1/2 L, Set of 6

Name: Weck 742 Mold Jar 1/2 L, Set of 6
Brand: Weck

#4 · Best Value

6.9 /10 Our score

Lowest verified price $39.99 Amazon

Our verdict

A cheap, durable choice for fridge staples at home. Treat it as a jar, not a lunch box.

Pros

Thick glass, ranked first for longevity
No plastic in the closure
Replaceable rings and clamps
Low cost per jar
Good for soups, yogurt and grains

Cons

Clips are easy to lose
Glass lids can break
Replacement parts harder to find
Freezing is recommended only with Weck's plastic covers
Weck doesn't state the glass type

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Last reviewed November 2, 2026

Review

What to know about Weck 742 Mold Jar 1/2 L, Set of 6

German-made straight-sided glass jars (19.6 fl oz each) with glass lids, rubber rings and metal clamps, so there's no plastic in the closure. TechGearLab's best overall canning jar, praised for its thick glass and longevity. A repairable, inexpensive choice for soups, grains and pantry storage, but fiddlier than snap lids.

Editorial notes

Why it stands out

Why we like it

TechGearLab named the Weck 742 its Editors' Choice and best overall canning jar. It cited the thickest glass in its test and ranked it first for longevity. Rings and clamps are sold separately, so a worn part doesn't mean replacing the jar.

At about $6 a jar, it is the cheapest liquid-capable option here. TechGearLab lists six for about $24, so look for a lower price than Amazon's current one.

What to know

Skip it if you want grab-and-go lunch containers. That was a canning test, not a food-storage leak test, and TechGearLab reported no seal rate and called the jars finicky.

Performance

Score breakdown

Seal & Leakproofing

Whether the lid stays leakproof and airtight when shaken, inverted or tipped (ATK, TechGearLab, Reviewed, Your Best Digs, Gadgeteer tests), and whether the seal survives dishwashing.

6.5

The clamped rubber ring can seal well, but there's no storage leak test and TechGearLab called it finicky.

Health & Materials

How much plastic touches food. Fully plastic-free glass/silicone/bamboo/steel lids score highest; glass bases with plastic lids score lower. Also considers glass type (borosilicate vs tempered soda-lime), coatings and explicit BPA/PFAS-free disclosures.

7.5

Glass, rubber and steel; the glass type is unstated and Weck recommends plastic covers for freezing.

Durability & Heat Safety

Thermal-shock tolerance, oven/microwave/freezer limits for both bowl and lid, breakage reports, latch and lid warping, and warranty and replacement-lid availability.

7.0

Thickest glass and first for longevity at TechGearLab, but the lids can break and there's no oven rating.

Stain & Odor Resistance

Resistance to tomato-sauce staining and lasting odors (fish, garlic, fermented foods) on lids and gaskets after washing.

7.0

Glass doesn't stain; the rubber rings may hold odors but can be replaced.

Ease of Use

How easy the lids are to close and open (including vacuum suction after hot food cools), stacking and nesting, weight, vented microwave reheating, range of sizes and dishwasher-safety of every part.

5.5

Clamps and loose rings are fiddly and there's only one size.

Value

Price per usable container and per cup of capacity relative to performance, warranty and longevity.

8.0

About $6 per jar, or about $4 at TechGearLab's $24 list price.

Specifications

Weck 742 Mold Jar 1/2 L, Set of 6 specs

Materials

Lid material: Glass
Plastic-free lid (no plastic in lid/seal): Yes
Seal / gasket material: Rubber ring with metal clamps
Manufacturer states PFAS-free: No

Set

Number of containers: 6 containers
Container capacity range: 19.6 fl oz each

Heat

Lid microwave-safe: Yes

Care

Lid dishwasher-safe: Yes

Shopping

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Prices and availability may change. The retailer's price and availability at checkout govern the transaction.

Retailer	Price	Availability
AmazonLowest	$39.99 $44.49	In Stock	View deal

Lowest verified price $39.99

30-day low $35.00

90-day average $37.33

90-day low $35.00

Based on 23 retailer price observations captured during the last 90 days.

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