Are these containers airtight?

They are not sold as airtight or leakproof. They work well for dry goods and fridge organization, but fine flour, liquids and strong odors can escape past simple lids.

Can they go in the dishwasher?

Clear plastic bins of this type usually survive the top rack, but hand washing the lids keeps them from warping. Check the base of each piece before the first wash.

Do the lids fit every size?

Each lid matches its own container; the graduated sizes mean lids are not interchangeable across the set. Keep lids paired with their bins.

What can I store in them?

Cereal, rice, pasta, snacks, baking staples, produce and leftovers. Avoid hot liquids and very greasy foods, which can warp or stain the plastic.

How do they compare with glass containers?

Plastic is lighter, cheaper to replace and safer around kids, but glass resists stains and odors better and is oven-safe. These suit dry storage, not reheating.

Can the bins stack on each other?

Yes, the rectangular shape and flat lids allow stacking, though heavy loads on the largest bin can stress the plastic. Keep the heaviest items at the bottom.