Are the lids really airtight?

Yes. The wire bail pulls the lid down onto a silicone gasket, which seals the rim. Press the clasp fully closed and check that the gasket sits flat.

Can these jars be used for canning?

They work for water-bath canning of high-acid foods like jams and pickles. They are not pressure canners, so do not use them for low-acid vegetables or meats.

Are they freezer and dishwasher safe?

The glass can go in the fridge, but freezing is risky because food expands and can crack the jar. Hand wash the lids and gaskets to keep the seal and finish intact.

How much do the jars hold?

Each jar holds 34 oz, about a liter. That fits a standard bag of coffee, a pound of pasta or a box of cereal.

What is included in the pack?

Four glass jars, four wire clip lids and four silicone gaskets. Lids come in mixed colors.

How do they compare with Mason jars?

The clamp lid opens and closes faster than a screw band, and the square shape packs tighter. Mason jars are cheaper and easier to find replacement lids for.