TROUBLESHOOTING & CARE GUIDE
Fusion Food Jars
Hot lunch tips
- Pre-heat your jar by filling it with boiling water for 10–15 minutes prior to use.
- Loosely place the lid on top while pre-heating and avoid opening during this time.
- While pre-heating, heat your food hotter than you intend to eat it, as it will naturally cool during the day once food is transferred.
- Empty the water and immediately fill with HOT food.
- Fill the jar as full as possible. Empty space allows heat to escape more quickly.
Important Performance Tip:
We do not recommend storing your Food Jar inside a lunch bag compartment that contains an ice pack. Prolonged exposure to cold elements will significantly impact performance.
Cold lunch tips
- Pre-cool your jar by filling it with ice and cold water for 10 minutes prior to use.
- Screw the lid on while cooling
- Empty and immediately fill with chilled food.
- Store away from heat sources where possible.
Lid Closure & Seal Placement
Correct lid alignment and tightening
Please make note not to overtighten
Correct seal positioning
Seal must sit flat and fully seated in the groove
Keeping the tab internal to the lid
Tab must remain internal to avoid leakage
How to remove and replace the seal
Use the tab to pull the seal out for cleaning
Cleaning & Care
Every part of our Food Jars — base, lid and accessories — is dishwasher safe up to 70°C.
For best care:
- Wipe away excess moisture after washing
- Ensure jar, lid and seal are completely dry before storing
- We recommend hand washing the lid for longevity
My jar smells: To remove any residue that may be causing smells, we recommend that you pour approximately 1 tablespoon of baking soda into the jar, followed by white vinegar. Let that bubble up. After letting it bubble up for a bit give it a really good scrub using a bottle brush or a scouring pad and rinse with hot water.
Performance Expectations
Our Food Jars have been carefully tested to keep food warm and ready to enjoy at lunchtime.
Food safety guidelines are set by official food standards authorities. As the manufacturer, we design and test our jars to perform as intended. However, food preparation, heating methods and packing are managed by each individual user.
Once food is packed, several factors can affect how long it stays hot, including:
- Starting temperature
- Pre-heating method
- Type and density of food
- How full the jar is
- Frequency of lid opening
- Proximity to cold elements
For best results, always pre-heat your jar and pack food as hot as possible.
Will it fit?
In a Feast Lunchbox
Yes. Our Mini Food Jar fits inside.
In a Large Lunch Bag
Large Food Jar Fits inside with Bite Lunch Box
In a Large Lunch Bag
Large Food Jar Fits inside with Feast Lunch Box
General Food Jar FAQ
To get the best temperature performance from your Food Jar, following the correct preheating and storage tips are key.
Pre-heat your jar by filling it with boiling water for 10–15 minutes prior to use.
Loosely screw the lid on top while pre-heating and avoid opening during this time.
While pre-heating, heat your food hotter than you intend to eat it, as it will naturally cool during the day once food is transferred.
Empty the water and immediately fill with HOT food.
Fill the jar as full as possible. Empty space allows heat to escape more quickly.
Important Performance Tip:
We do not recommend storing your Food Jar inside a lunch bag compartment that contains an ice pack. Prolonged exposure to cold elements will significantly impact performance.
If you are following these simple steps and you still find there may be an issue, our friendly Customer Service team is always here to help. Refer to our Customer Service page
These seals are designed to be removable for easy cleaning.
Simply pull out the rubber O-seal, hand wash it, and dry it completely. When placing it back in, make sure the seal is pushed all the way in so it sits flat, this ensures the lid creates the proper leakproof seal.
No - unfortunately our Food Jars are not designed to be placed into the microwave.
For more information, check out the ‘Nitty Gritty’ tab in the product listing.
No - unfortunately our Food Jars are not designed to be placed into the freezer.
For more information, check out the ‘Nitty Gritty’ tab in the product listing.
We currently have two sizes in our Food Jar range to choose from: Our Mini Food Jar is just right for snacks or smaller portions. Our Regular Food Jar is perfect for hearty meals. For specific sizes and dimensions check out the 'Nitty Gritty' tab on the product listing.
Yes! Our Large Bumpers are designed to fit both the Regular (400ml) and Mini (200ml) Food Jars perfectly. They add an extra layer of protection against knocks and drops—keeping your Food Jar looking newer for longer.
Yes! Our Mini Food Jar fits perfectly inside the Feast Lunch Box. Not sure which combo is right for you? Check out our handy Size Guide to find the best fit for your little one’s lunches.
Yes! Our Food Jars are 100% leakproof. The lid features a removable silicone seal to keep food safely inside (and makes cleaning super easy too!).
It really depends on what you’re packing. Our small Food Jars are just right for little snacks, baby food, or smaller portions. Our large Food Jars are perfect for bigger appetites and hearty meals. Both current sizes are insulated to keep food warm or cool for hours. Keep in mind you do need to pack it full for best performance, so the best choice comes down to how hungry your little (or big) eater is. Still not sure which size to choose? Check out our Size Guide
Yes! Each Food Jar lid has an easy-grip silicone band, making it simpler for little hands to open and close on their own.
Accessories & Replacement Parts
We’ve got you covered! Depending on the product, we offer a range of replacement parts—like seals and lids—to help keep your Food Jar working at its best.
You can browse our Replacement Parts Collection anytime to find what you need. If you’re unsure which part is right for your jar, our friendly team is always happy to help—just reach out to us via our Contact Page
Materials and Safety
No nasties here! Our Food Jars are made from vacuum-insulated, double wall stainless steel (18/8 and 304) with food-safe silicone parts. They’re also completely lead-free, so you can feel confident knowing your food is safe and fresh.
If you’d like to dive deeper into the specifics, you’ll find all the details under the “Nitty Gritty” tab on each product listing.
Absolutely! Our Food Jars are BPA-free and lead-free, so you can trust that your food is stored safely. Want all the finer details? You’ll find them under the “Nitty Gritty” tab on each product page.
All MontiiCo Food Jars are thoughtfully designed in Australia and responsibly manufactured in China by our trusted partners, who share our high standards for safety and quality.
Food Jar Warranty
Yes! All MontiiCo products, including our Food Jars, come with a 6-month warranty from the date of purchase. If you ever experience a fault with your product during this time, or for more information about the warranty on your specific product, please refer to our Customer Service page
Our warranty covers any faults that happen during the manufacturing process. So if your Jar or lid isn’t performing the way it should because of a defect, we’ll sort it out.
Depending on the issue, we’ll replace the faulty part or the whole product. Some examples include:
- A lid that won’t seal properly due to a manufacturing fault
- A jar that isn’t keeping food at temperature as promised
- A part that arrives damaged or stops working sooner than expected with normal use
What’s not covered are things that happen through everyday wear and tear or accidental damage. This includes scratches, dents, paint chips, fading, mould caused by improper cleaning, or damage from drops or misuse.
Not sure if your issue is covered? Our friendly customer service team is always happy to help — just reach out and we’ll take a look.
Please refer to our Customer Service page for more information or to get in touch
Super easy! Just head to our Customer Service Page and fill in the form with:
1. Your order details or proof of purchase
2. A clear photo of the issue
Our team will review it and get back to you within 24–48 hours to help you out.