Glasslock 18-Piece Assorted Oven Safe Container Set

The container body is tempered glass — no coatings, no nonstick layer, nothing to chip into your food. It won't pick up tomato sauce stains or garlic smell, ever. The one thing to watch: don't pull it from the freezer and put it directly into a hot oven — let it sit at room temperature for 10 minutes first to prevent thermal shock cracking.

The lids are BPA-free plastic with a silicone seal ring. The silicone ring is inert and safe. The plastic lid body is a food-contact surface when your container is stored on its side or stacked upside-down. It's better than unlabeled plastic, but it's still plastic — and no independent lab has checked it for BPA replacement chemicals.

Glasslock discloses BPA-free and nothing else. The glass containers don't need claims — glass doesn't have BPA, phthalates, or PFAS to begin with. For the plastic lids, one claim is the minimum. If the PP lid had BPS-free and phthalate-free claims, you'd have more confidence. Without them, the lid's chemical profile is partially unknown.

Glasslock is FDA-cleared for food contact, which is the legal minimum to sell food storage containers in the US. What's missing is an independent lab that tested them specifically for PFAS, heavy metals, and plasticizers in the plastic lids. That's the gap. Brands like Caraway and Snapware have obtained those certifications — Glasslock hasn't published equivalent testing.

Four locking tabs around the lid means it seals tight on all sides — these won't pop open in your bag or leak in transit. The silicone ring in the lid creates an airtight seal that keeps food fresh longer. The trade-off: you have to snap all four tabs every time you close it, and it takes two hands.

Tomato sauce, turmeric, garlic, beets — none of them stain glass. Nothing soaks into a glass surface. You can store fish in one of these containers overnight and it'll smell like nothing after a wash. This is the single biggest practical advantage of glass over any plastic option.