PlanetBox Glass Food Storage Container
Borosilicate glass tubs whose lids are a glass window in a silicone rim - no plastic disc over the food, and no plastic flip tabs.
The verdict: Silicone only
Glass on both halves. The body is borosilicate, and the lid is a clear borosilicate disc set into an LFGB silicone rim that grips the jar - so the surface facing the food is glass, and the silicone is confined to the rim that does the sealing. This is the part worth paying attention to, because the lid is where nearly every glass storage set gives up: the standard design is a rigid plastic lid with a thin silicone bead and four plastic clamps, and that plastic disc sits directly over the food, touching it whenever the tub is full or tipped. Nothing in this one is plastic at all. Sold under PlanetBox's PlanetGoods line, the adult kitchen half of the company.
What it's made of
| Part | Material | Food contact |
|---|---|---|
| container body borosilicate rather than soda-lime, so it takes freezer-to-oven temperature swings | Borosilicate Glass | Yes primary |
| lid window clear glass disc set into the lid; the face that sits over the food is glass, not plastic | Borosilicate Glass | Yes primary |
| lid rim LFGB silicone rim carrying the glass disc and gripping the jar; has a moulded pull tab | Silicone | Yes seal |
Straight-sided glass tubs in round and square shapes, each sold in three nesting sizes - roughly 1.2, 2 and 4 cups - or as a six-piece set of three tubs with lids. The lid pushes on and comes off by a moulded tab on the rim, and the glass centre means you can see the contents with the lid on. The body goes in the oven and the microwave with the lid off, and both parts are dishwasher safe. The glass is clear rather than tinted throughout.
Pros
- Borosilicate handles freezer to oven without the thermal-shock risk of soda-lime glass
- No plastic clamps to snap off, which is how most glass sets die
- Glass lid window means you can see the contents without opening
- Sizes nest for storage; body is oven and microwave safe with the lid removed
Cons
- A push-on rim seals less firmly than clamped lids - fine for fridge, not for a bag
- Silicone slackens over years of dishwashing and will need replacing
- Glass is heavy and breakable, and the lid adds a second glass part to break
- Sold in a narrow size range compared with the big glass sets
Notes
- Available as single containers or as a six-piece set (three containers plus three lids), in round and square.
- Branded PlanetGoods rather than PlanetBox - same company, same site, aimed at adult kitchen use rather than kids' lunches.
- Not marketed as leakproof; treat these as fridge and pantry storage rather than lunch containers.
Common questions
Does the PlanetBox Glass Food Storage Container have plastic in it?
No petroleum plastic touches your food. On the PlanetBox Glass Food Storage Container, the lid rim is silicone, and the rest of the food path is borosilicate glass.
What is the PlanetBox Glass Food Storage Container made of?
Part by part, the PlanetBox Glass Food Storage Container is: container body — borosilicate glass; lid window — borosilicate glass; lid rim — silicone.
Does the PlanetBox Glass Food Storage Container have silicone in it?
Yes — the lid rim is silicone on the PlanetBox Glass Food Storage Container. It is a seal rather than a surface your food sits against, which is borosilicate glass.
Is the PlanetBox Glass Food Storage Container BPA-free?
No plastic touches your food on the PlanetBox Glass Food Storage Container — the food path is borosilicate glass and silicone — so BPA, which comes from polycarbonate and epoxy plastics, is not in play here.
Where is the PlanetBox Glass Food Storage Container made?
The PlanetBox Glass Food Storage Container is made in China.
Categories: Food Storage Containers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://www.planetbox.com/products/round-glass-food-storage-container spec line reads - Material: Borosilicate glass and LFGB-certified silicone; product copy describes clear glass bodies with a leakproof silicone seal
- manufacturer https://www.planetbox.com/products/round-glass-food-storage-6-piece-set six-piece set listing; same two-material spec, confirms lids are sold as part of the set rather than as a separate plastic component
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.