#3 of 7

Yumbox Original Leakproof Bento Lunch Box

Key Specs

Tray Material

Tritan (BPA-free copolyester)

Outer Shell Material

ABS plastic

Seal Material

Food-grade silicone

Compartments

5 + dip well

Yumbox

Yumbox Original Leakproof Bento Lunch Box

#3 of 7 lunch boxs tested

6.2R3 Score / 10

There are better options — here's why.

Safety

5.948% weight

Usability

7.530% weight

Efficacy

5.322% weight

$32.99

Buy on Amazon

The bottom line

What the product listing won't tell you

Know before you buy

The Yumbox Original's single-lid leakproofing and single-latch ease of opening are genuinely the best in class for ages 3–7, but you're getting a Tritan plastic food-contact tray — not stainless steel — with no PFAS-free claim, a compartment capacity that scores low for older kids, and a shell that needs hand washing every day.

Buy it if

Your child is ages 3–7 and needs to open their lunch box independently — the single latch is the easiest in the category.

Skip if

You want a plastic-free food-contact tray — the Yumbox Presto or Pret have stainless steel trays.
You need the entire box (not just the tray) to be dishwasher safe — the shell requires daily hand washing.
Your child is older or a bigger eater — the 2.5–4 cup capacity may not be enough.
Your child packs tomato sauce, curry, or berries frequently — expect tray staining within 6–12 months.

What's inside

Specs the product listing doesn't explain

Safety & Materials

What your food and family come into contact with every use

Tray MaterialTritan (BPA-free copolyester)

Outer Shell MaterialABS plastic

Seal MaterialFood-grade silicone

Dishwasher SafeTray: top rack | Shell: hand wash

CertificationsCPSIA, FDA 21 CFR

Living With It

Noise, maintenance, and what happens if something goes wrong

Warranty1-year limited

Price$32.99

Other Specs

Additional product details

Compartments5 + dip well

Empty Weight1.1 lbs

Dimensions8.5 × 6 × 1.8"

LeakproofYes — single-lid silicone seal

LatchSingle easy-open latch

Age RangeAges 3–7

Replacement PartsAvailable (tray, seal, latch)

How we scored it

7 criteria — open any layer to see exactly what we found

5.9

Safety

Mixed

5.3

Efficacy

Fair

7.5

Usability

Good

Food Contact Material SafetyCritical

65%

6.9▾

Criteria

Body / Tray Material

5/10

The tray your food actually touches is Tritan plastic — BPA-free and food-safe, but still a plastic. It can discolor with tomato sauce or turmeric and retain odors over time. If you want the safest material possible, look at Yumbox's stainless steel models (Presto/Pret).

Lid & Gasket / Seal Material

8/10

The silicone seal that creates the leakproof closure is food-grade silicone — the same material used in baking molds and baby products. It won't leach chemicals into your child's food.

Chemical Safety Disclosure

9/10

Yumbox says BPA-free, phthalate-free, and lead-free — and these are verified claims, not just marketing. There's no PFAS-free statement anywhere, which is worth noting. Take the safety claims at face value unless independent lab testing matters to you.

R3 verdict

The food-contact tray is Tritan — a BPA-free, phthalate-free copolyester that is among the safer plastics but is still plastic. The silicone gasket in the lid is food-grade and chemically stable.

Yumbox declares BPA-free, phthalate-free, and lead-free — all verified brand claims. PFAS-free status is not stated anywhere.

Seal & PortabilityCritical

55%

6.0▾

Criteria

Leak-Proof Performance

10/10

One lid, one close, everything sealed. You don't have to worry about individual containers leaking into each other or out of the bag. Yumbox has built its brand on this lid design, and it works — consumer reviews consistently confirm it holds up with wet foods and sauces.

Compartment Design & Capacity

1/10

Five sections plus a dip well means every food group has a place — no mixing, no squishing. Portion sizes are designed for ages 3–7 and score at the low end of the rubric's capacity scale. Older elementary kids or bigger eaters may find the portions too small.

R3 verdict

Third-Party Certification & VerificationCritical

35%

4▾

Criteria

Third-Party Safety Certifications

4/10

Yumbox passes the regulatory tests the US government requires — CPSIA and FDA food safety. That's a baseline, not a safety seal of approval. No independent lab has published PFAS or heavy-metal test results for Yumbox. If that level of verification matters to you, this box doesn't have it.

R3 verdict

Yumbox meets CPSIA and FDA 21 CFR standards — regulatory minimums required to sell children's products in the US. No independent PFAS/heavy-metal lab testing has been published.

No LFGB (German food safety), NSF, or Mamavation certification found. For a brand selling primarily to parents of young children, the absence of T1 independent verification is a gap worth flagging.

Moderate confidence

Child-FriendlinessImportant

55%

9.2▾

Criteria

Ease of Opening for Children

10/10

Your 4-year-old can open this themselves at lunch. That's the whole point of the single-latch design — no adult help needed, no frustration, no food going uneaten because the lid was too hard to open.

Empty Weight

8/10

At 1.1 lbs empty, this is on the lighter end for a bento box. For kids 5 and up, it's completely fine in a backpack. For 3–4 year olds with small bags, check whether 1.1 lbs plus food fits your child's backpack weight comfortably.

R3 verdict

The single-latch design is the best possible opening mechanism for children ages 3–7 — one button press or slide releases the entire lid. No secondary clips, no fighting a tight seal.

Durability & LongevityImportant

45%

4.4▾

Criteria

Material Durability

5/10

Expect 2–4 years of good daily use before the tray starts showing permanent staining from tomato sauce, curry, or berries. The plastic exterior scuffs and scratches over time. Plan to replace the tray (sold separately) or the whole box after a few school years.

Warranty Coverage

3/10

One year of warranty coverage is the minimum you'd expect on any lunch box. What helps: Yumbox sells replacement trays, seals, and latches so you can extend the life of the shell. If a latch breaks at month 14, you can fix it without buying a whole new box.

R3 verdict

Cleaning & MaintenanceImportant

45%

5.5▾

Criteria

Ease of Cleaning

5/10

The tray goes in the dishwasher. The outer box doesn't — hand wash the shell to keep the silicone seal working properly. Every day. If full dishwasher convenience is a must-have, this box doesn't deliver it.

Stain & Odor Resistance

6/10

Tritan is better than standard polypropylene at resisting stains, but it's still plastic. Pack curries, tomato sauce, or blueberries repeatedly and expect some permanent discoloration in the tray after a few months. The tray is sold as a replacement part, which helps.

R3 verdict

Price EfficiencyNice to have

8▾

Criteria

Price per R3 Point

8/10

At $32.99 with strong leakproof and usability scores, the Yumbox Original is well-priced. If you want stainless steel instead (Yumbox Presto), budget $50–60 for the upgrade.

R3 verdict

At $32.99 with price per R3 point of $0.446 — strong value. This pillar contributes 0% to the overall score but is displayed for buyer context. The Yumbox Original is competitively priced for its category, especially relative to stainless steel alternatives at $45–60.

Moderate confidence

Read the full methodology

How we scored it

7 criteria — open any layer to see exactly what we found

5.9

Safety

Mixed

5.3

Efficacy

Fair

7.5

Usability

Good

Food Contact Material SafetyCritical

65%

6.9▾

Criteria

Body / Tray Material

5/10

Lid & Gasket / Seal Material

8/10

The silicone seal that creates the leakproof closure is food-grade silicone — the same material used in baking molds and baby products. It won't leach chemicals into your child's food.

Chemical Safety Disclosure

9/10

R3 verdict

The food-contact tray is Tritan — a BPA-free, phthalate-free copolyester that is among the safer plastics but is still plastic. The silicone gasket in the lid is food-grade and chemically stable.

Yumbox declares BPA-free, phthalate-free, and lead-free — all verified brand claims. PFAS-free status is not stated anywhere.

Seal & PortabilityCritical

55%

6.0▾

Criteria

Leak-Proof Performance

10/10

Compartment Design & Capacity

1/10

R3 verdict

Third-Party Certification & VerificationCritical

35%

4▾

Criteria

Third-Party Safety Certifications

4/10

R3 verdict

Yumbox meets CPSIA and FDA 21 CFR standards — regulatory minimums required to sell children's products in the US. No independent PFAS/heavy-metal lab testing has been published.

No LFGB (German food safety), NSF, or Mamavation certification found. For a brand selling primarily to parents of young children, the absence of T1 independent verification is a gap worth flagging.

Moderate confidence

Child-FriendlinessImportant

55%

9.2▾

Criteria

Ease of Opening for Children

10/10

Empty Weight

8/10

R3 verdict

The single-latch design is the best possible opening mechanism for children ages 3–7 — one button press or slide releases the entire lid. No secondary clips, no fighting a tight seal.

Durability & LongevityImportant

45%

4.4▾

Criteria

Material Durability

5/10

Warranty Coverage

3/10

R3 verdict

Cleaning & MaintenanceImportant

45%

5.5▾

Criteria

Ease of Cleaning

5/10

Stain & Odor Resistance

6/10

R3 verdict

Price EfficiencyNice to have

8▾

Criteria

Price per R3 Point

8/10

At $32.99 with strong leakproof and usability scores, the Yumbox Original is well-priced. If you want stainless steel instead (Yumbox Presto), budget $50–60 for the upgrade.

R3 verdict

Moderate confidence

Read the full methodology

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Where to buy

Verified retailer — current pricing

Starting price

$32.99

R3 approved retailer Score unaffected by purchase

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We earn a small commission on purchases. It never influences our scores — R3 is funded by readers, not brands.

Other Options to Consider

Alternatives that address specific trade-offs

Why this matters: Yumbox meets CPSIA and FDA 21 CFR standards — regulatory minimums required to sell children's products in the US. No independent PFAS/heavy-metal lab

Better third-party certification & verification

PlanetBox Rover Stainless Steel Bento Lunch Box

PlanetBox

8.0$69.28

Scores 5.0/10 on third-party certification & verification vs 4.0 here

Didn't find the lunch box you need?

See all lunch boxs we reviewed

The Yumbox Original's defining strength is its one-piece lid with a molded silicone gasket that seals all 5 compartments simultaneously in a single close. This is the most reliable leakproof architecture in the bento box category. The compartment design scored low against the rubric capacity band thresholds — the 2.5–4 cup total capacity is optimized for ages 3–7 but scores below the mid-tier for older children with larger appetites.

Tritan plastic trays have a realistic 2–4 year daily-use lifespan before discoloration and odor retention become permanent. The ABS outer shell will show scuffs and cracks before stainless alternatives.

The 1-year warranty is the industry minimum and leaves you unprotected after year one. Replacement trays, seals, and latches are available separately, which meaningfully extends useful life and reduces waste.

Yumbox Original Leakproof Bento Lunch Box

The bottom line

Safety research

What's inside

How we scored it

Where to buy

Other Options to Consider

PlanetBox Rover Stainless Steel Bento Lunch Box