Are the containers really airtight?

The set uses locking lids with a silicone seal. They hold dry goods and liquids well when the lid is fully latched, but the seal weakens if lids are washed on a hot cycle or left unlatched.

Can they go in the dishwasher and freezer?

Yes. The plastic is dishwasher safe and freezer safe. Put lids on the top rack and leave headroom when freezing liquids so the container does not crack.

Is the plastic BPA-free and food safe?

Yes, the set is BPA-free and made for food contact. It is not designed for microwave use unless the manufacturer states otherwise, so reheat in another dish.

How much do the containers hold?

The main jars hold about 35 oz, enough for a bag of flour, cereal or pasta. The 32-piece count includes smaller pieces, so check the mix if you need uniform sizes.

Will they stain or pick up smells?

Clear plastic can stain from tomato, turmeric and curry and may hold odors over time. Glass or stainless steel resists this better, but plastic is lighter and cheaper to replace.