Yumbox Original Leakproof Bento Box
One of the two default kids' bento boxes, and it is plastic - a molded plastic tray and plastic lid with a silicone-lined seal, so food dwells in plastic for hours in a warm bag despite the "leakproof" reputation.
The verdict: Mostly plastic
The Yumbox Original is a molded plastic tray under a plastic lid, and the leakproofing comes from a silicone-lined seal around the lid's rim. Food sits directly in the plastic tray - often packed warm and left in a hot backpack for hours - which is exactly the dwell-time exposure the lunch-box category is about. Yumbox markets it as BPA- and phthalate-free rather than plastic-free, and it isn't: the entire food-contact surface is plastic. Included here as a corrective, since alongside Bentgo it's one of the two giant kids-bento sellers most parents reach for by default.
Verification: Manufacturer confirmed · Last reviewed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| compartment tray (food wells) molded BPA-/phthalate-free plastic; food sits directly in the tray | Plastic other / unspecified | Yes primary |
| outer lid / shell plastic lid that presses down over the tray | Plastic other / unspecified | Yes incidental |
| lid seal silicone-lined seal around the lid rim that creates the leakproof closure | Silicone | Yes incidental |
| latch plastic easy-open latch | Plastic other / unspecified | No |
Yumbox's flagship kids' bento, and one of the two boxes (Bentgo is the other) that dominate the school-lunch market. A single latch closes one lid over many compartments, and the silicone-lined seal keeps wet foods like yogurt from crossing between wells, so it can be packed upright in a bag. A well-made, popular box for daily school lunches. Yumbox also sells a stainless "Pret" line that moves the tray to steel.
Pros
- Genuinely leakproof one-latch design that keeps wet foods separated
- BPA- and phthalate-free; durable enough for daily school use
Cons
- The food tray and lid are plastic - food sits in plastic for hours, often warm
Categories: Lunch Boxes
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://yumboxlunch.com/products/yumbox-original-leakproof-bento-box-for-kids Original is a BPA-/phthalate-free molded plastic tray and lid with a silicone-lined seal for leakproofing
- review https://www.cubbyathome.com/review-yumbox-original-bento-lunchbox-80018019 independent review describing the plastic tray/lid construction and silicone-sealed leakproof lid
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