Blue canisters and storage sets are most commonly made from glass (including borosilicate), ceramic, and BPA‑free plastic — so you’ll find glass, plastic, and ceramic options in blue finishes.
Yes — many blue canister sets are described as stackable or nestable so containers and lids fit neatly together to save cabinet or fridge space. Some listings also note “universal” lids that stack with multiple pieces.
Listings typically use terms like “airtight,” “air tight seal,” and “leakproof,” and sometimes more specific phrases such as “100% airtight silicone seal.” They also reference sealing mechanisms—secure hinge clips, clamp locks, locking clips or internal gaskets—as how the seal is formed.
