Bentoheaven Bento Box Adult 40 oz Symph Onyx — Two-Tier Stackable Lunchbox, Leak-Resistant Lid

Designed for adults who want tidy, portion-controlled lunches, the Symph Onyx blends Japanese-style two-tier organization with modern leak-seal performance and sleek wood-grain styling. Its stackable 20 oz containers keep mains, sides and sauces separate while the silicone-sealed lid and vent plug let you carry dressings or saucy dishes securely when sealed correctly. The compact footprint fits most work bags and refrigerators and includes reusable utensils plus a 30-recipe e-book to jumpstart meal prep.

How does the two-tier design keep foods separate and fresh?

The Symph Onyx uses two independent 20 oz containers stacked under a single wood-grain lid so you can pack main dishes and sides without mixing flavors or textures. A removable internal divider lets you split one tier into two compartments, and a small dip cup stores sauces or dressings inside the same layer.

• Two 20 oz tiers (40 oz total) for mains and sides
• Removable divider creates multiple compartments in a tier
• Included dip cup isolates sauces to prevent sogginess
• Wood-grain lid secures both tiers and looks professional on a desk

Is the box leakproof for dressings and saucy meals?

The lid features a silicone seal and a built-in air-vent plug that create a tight closure when pressed down fully. For dressings and moderately saucy foods the seal works well if assembled correctly; very runny liquids should be kept upright to avoid risk of leakage during transport.

• Silicone-sealed lid with press-to-seat locking action
• Built-in vent plug lifts for easy opening, presses down to seal
• Leak-resistant for dressings and thick sauces when sealed properly
• Recommended to keep very liquid items upright while traveling

Can I use it in the microwave and dishwasher?

Yes — the bowls are microwave-safe when used without the lid, and the components are top-rack dishwasher-safe for convenient cleanup. Materials are lab-tested BPA-free so they’re suitable for everyday food use, but follow the care instructions to maintain the silicone seal and printed wood-grain finish.

• Microwave-safe with the lid removed
• Top-rack dishwasher-safe components
• Lab-tested BPA-free food-grade materials
• Handwash the lid and seal if you want to preserve the wood-grain appearance longer

Who is this for? The Bentoheaven Symph Onyx bento box is ideal for adults who pack lunch regularly and want an organized, portion-controlled solution that looks polished at work. It suits commuters, office workers, students, and anyone who prefers separate compartments for mains, sides and sauces. If you prioritize a compact 40 oz capacity, reusable utensils, and a reliable silicone seal for saucy meals, this box provides a balanced combination of style, functionality and everyday convenience. Every purchase includes a utensil set, sealing strap and a 30-recipe e-book, and contributes support to Feeding America.