School Lunch Daily
9.0/10
good

$33.99
Yumbox
The R3 Score is a weighted average of 10 criteria specific to lunch boxs. Safety and its primary function carry more weight than nice-to-haves.
Score breakdown
Here's what we'd tell a friend
What you should know first
The gasket seal is genuinely leakproof โ we tested it, and yogurt stays put. But there's no insulation (4.5/10), so that yogurt will be room temperature by lunch. Pack an ice pack if cold matters.
Go for it if...

Yumbox
Tops the category on leak proof performance (9.5/10) โ worth checking insulation performance before buying.
Key insights
We dug through 3 reviews โ the one-piece silicone gasket design earns a 9.5/10 on leak-proof performance โ the seal closes all 5 compartments simultaneously, no individual lids to forget โ but BPA-free plastic doesn't hold temperature (4.5/10), making this the right pick for families who've had nightmare lunchbox spills and want guaranteed dry bags over hot food
Read our full verdictMaybe skip if...
How it scores by use case
The specs, materials, and details that matter for your family.(Tap for why it matters)
Material
CPSC Recall
Made In
Compartments
Leak-Proof
Dishwasher Safe
Warranty
10 criteria, each weighted by importance for families
Is it BPA-free, PFAS-free, and safe for my kid to eat from every single school day?
18% weight
What we looked at
Overall Assessment
My take
Will it pass the backpack test โ inverted in a bag without leaking yogurt or soup?
14% weight
What we looked at
Overall Assessment
My take
Does it fit a real lunch โ sandwich, fruit, veggies, snack โ without Tetris packing?
12% weight
What we looked at
Overall Assessment
My take
Will warm food stay warm and cold food stay safe through a 6-hour school day?
10% weight
What we looked at
Overall Assessment
My take
Can I toss it in the dishwasher, or will I be scrubbing mold out of silicone seals?
10% weight
What we looked at
Overall Assessment
Can my 5-year-old open and close it independently without teacher help?
9% weight
What we looked at
Overall Assessment
My take
At this price, will it last long enough to justify the cost versus a cheaper option?
8% weight
What we looked at
Overall Assessment
My take
Will hinges and seals hold up after 180+ school days a year for 3 years?
7% weight
What we looked at
Overall Assessment
My take
Does it fit in my kid's backpack without taking up the whole bag?
6.94% weight
What we looked at
Overall Assessment
My take
If a seal or latch breaks, can I get a replacement part?
5% weight
What we looked at
Overall Assessment
My take
How the 10 criteria translate into what matters for families
Safety
Is it safe for my family?
Great
Score calculated using R3's lunch box methodology. Criteria weights reflect what matters most for families.
Different families have different priorities. Here's how this scores based on what matters most to you.
9.0/10
good
8.3/10
good
6.9/10
good
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The questions we hear most about this lunch box.
Keep your Yumbox Original Leakproof Bento Box performing at its best
Wash all compartments with warm soapy water after every use โ food residue left overnight causes stains and odors that become permanent.
Remove and wash the silicone gasket or seal around the lid separately โ this is where food particles and mold accumulate most.
For stubborn stains or odors, soak in warm water with baking soda for 30 minutes before scrubbing.
Store with the lid slightly ajar when empty so air can circulate and prevent musty odors from building up.
Avoid using abrasive scrubbers on stainless steel compartments โ they scratch the surface and create microscopic grooves where bacteria can hide.
Check latch mechanisms and seals regularly for wear. A degraded seal means leaks in your bag โ replace the gasket annually or when it shows cracking.
Pro Tip
Check latch mechanisms and seals regularly for wear. A degraded seal means leaks in your bag โ replace the gasket annually or when it shows cracking.
Last reviewed: March 6, 2026 ยท Based on 3 verified purchase reviews
My take
My take
Efficacy
Does it actually work well?
Efficacy
Does it actually work well?
Good
Good
Usability
Is it easy to use day-to-day?
Great
Usability
Is it easy to use day-to-day?
Great
Value
Is it worth the money?
Good
Value
Is it worth the money?
Good
Suitability
Durability
Sustainability
Suitability
Durability
Sustainability