Are these containers airtight enough for flour and cereal?

Yes, the lids seal to keep dry goods fresh, but check that each lid is fully pressed down. Wipe the rim clean before closing so the seal stays tight.

Can I put them in the microwave or dishwasher?

Treat them as hand-wash and no-microwave unless the packaging says otherwise. Hot food and dishwasher heat can warp plastic and loosen the lids.

Clear plastic can pick up color and smell from oily, spiced foods over time. Use them mainly for dry goods, or line them for messy leftovers.

Each container holds 41 fl oz, roughly 1.2 liters. That fits a standard bag of flour, a box of cereal or several cups of leftovers.

Yes, the matching size and flat lids let them stack in a cupboard or fridge. Stack only a few high so the lower lids are not strained.

At Walmart, for $66.39, as of our latest check.

$66.39at WalmartChecked 1 h ago

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