Essential Information

What materials are in OmieBox?

OmieBox is made of ABS, PP, food grade silicon, and 18/8 304 grade stainless steel.

Is OmieBox BPA free?

Yes, OmieBox is BPA free and meets all FDA and CPSIA safety requirements. 

Where is OmieBox made?

OmieBox is responsibly made in China.

Is OmieBox leakproof? 

Yes. OmieBox has three leak-proof compartments which can hold up to 1 teaspoon of liquid each. Wet foods (soup, yogurt, dressing) should go inside the thermos.

Sub-sections created by using the divider are not leak-proof. The divider just meant to separate the peas from the carrots.

If you have an original OmieBox model, the square compartment is not leak-proof

If you have redesigned OmieBox model, the square compartment is leak-proof

 Is OmieBox microwave safe?

No, please do not place OmieBox in the microwave.

Is OmieBox dishwasher safe?

Handwashing is best. The high heat & harsh detergents used in dishwashers can damage OmieBox. Gentle hand washing keeps your OmieBox in tip top shape!

What are the dimensions & volume of OmieBox?

Width: 8.5 inches, Length 7.5 inches, Depth 3 inches

Weight: 1.4 lbs without thermos, 1.7 lbs with thermos

Thermos volume: 8.5 oz

Square compartment volume: 21 oz

Long compartment volume: 16 oz

Short compartment volume: 10 oz

Do's and Don'ts
  • Use caution when handling hot contents. Hot contents can cause pressure to build within the thermos resulting in a release of hot steam. Open with care to avoid burns.
  • Don’t over tighten the thermos lid.
  • Don’t pack carbonated or fermented items inside the thermos.
  • Don’t boil the thermos.
  • Don’t put the OmieBox or its thermos inside the microwave (or any heat source)
  • Do use extreme caution when opening a stuck thermos lid as the internal pressure might cause the lid to eject forcefully. Always point it away from people and pets to avoid injury.
  • Don’t put OmieBox or any of its components in the dishwasher.

Assembly Instructions

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Where can I find detailed assembly instructions?

Use Instructions

How should I prepare my thermos for optimal insulation?

Fill your thermos with hot water from a kettle and let it stand with the lid off for 5 minutes. Then carefully pour out the hot water. Use extreme caution when handling hot liquids! 

Is there a limit to how much food I can fit in my thermos?

Do not fill the thermos past the ridge below the neck or it might leak.

Can I boil the OmieBox thermos?

No. Boiling the thermos has no effect on its insulation performance, and can in fact completely damage the thermos. 

Care Instructions

How should I clean OmieBox?

Hand wash with warm soapy water and let everything dry completely.

How should I clean the seals?

There are two silicon seals in your OmieBox. There is one large square seal that goes around the perimeter of the box. The other is a round O-ring that goes around your thermos lid. Both need to be removed daily for cleaning. Wash in warm soapy water and let dry completely. Without daily cleaning, silicon is highly prone to mold growth which is irreversible and requires the part to be completely replaced. No biggie, we all get busy and forget sometimes. Should mold grow, just come to our website to buy spare seals - we’ll keep plenty in stock for you.


My thermos isn’t keeping my food warm enough 

OmieBox is designed for kids 3-8 years old. To minimize and prevent any potential burns on small children, we constructed the thermos to maintain food at slightly cooler temperatures than an adult might desire.

But we do have a few pro tips to make sure your thermos works as designed! First - always preheat your thermos with hot water. Second - opt for foods like soup or items with sauce. Bread based items such as quesadillas or chicken nuggets won’t stay warm very long. If you think your thermos isn't performing at its best, you can test the insulation of your thermos by following the steps below: 

  • Put the thermos on a flat surface and pour boiling water into the thermos.
  • After about 5 minutes, feel the outside of the thermos (below the neck).
  • If you feel any hot spots, the  insulation has been compromised and you may be eligible for a replacement thermos.
 What if my OmieBox is leaking?

If your OmieBox is leaking, first re-install the lid seal or the O-ring gasket. 9 out of 10 times it’s because these two items are installed improperly. Follow the installation instructions and double check that the gasket is smooth and even. Kinks or waves can cause leaking.

After packing food, close the lid and latch it. Be sure to use the palms of your hands to push along the entire surface area of the lid. This helps to engage the seal.

Did you accidentally put it in the dishwasher? If you did, then this could explain why it’s leaking. The dishwasher’s high heat could cause warping, which is why your box is leaking.

 What if I can't open my OmieBox Thermos?

If your OmieBox thermos lid is hard to open, please try giving it a 20 minute ice-bath. Don't use excessive force, as forcing the lid open could lead to sudden pressure release and increase the likelihood of an accident! Always point any stuck lids away from people or pets to avoid injury.

Please do not attempt to force the lid open. Just email us at and we'll send you a warranty replacement.

Why is there a white mark on my lid?

You might notice a small white mark on your lid. Rest assured this isn't a manufacturing defect! It’s the location where our machine injects plastic into the mold to form the top lid. We purposefully put the injection hole in this location because it forms the flattest lids possible (and having a flat lid is the key ingredient to making OmieBox leakproof). This design causes a small white mark to appear on the lid after molding.

Purchase Information

I lost a piece of my OmieBox. Where can I buy spare parts?

We carry spare parts exclusively on our website. If you’re not sure what to get, please contact us at

Do you sell utensils for OmieBox?

Yes! You can purchase our popular utensil set with carrying case on our website or Amazon.

What kind of lunch bag should I buy for OmieBox?

We have a lunch bag that’s sized perfectly for OmieBox! It’s available for purchase on our website or Amazon.

What water bottle fits inside OmieBox?

We have a water bottle that’s sized perfectly for OmieBox! It’s available for purchase on our website or Amazon.

Can I buy OmieBox in my country?

Please check our retailer list to see if there’s a store in your country that carries OmieBox. If not - ask your favorite retailer to contact us! We’re always looking for awesome retail partners. Sorry but we do not ship internationally - either on our website or Amazon.