Introduction
The THERMOS FUNtainer 10 Ounce Food Jar is designed to keep your child's food hot or cold for hours. Featuring THERMOS vacuum insulation technology, this durable stainless steel food jar is ideal for school lunches, picnics, or any on-the-go meal. It includes a convenient folding spoon stored within the lid, making it a complete solution for packing meals.

Image: The THERMOS FUNtainer 10 Ounce Food Jar in Navy, shown with its integrated folding spoon.
Product Overview and Features
The FUNtainer food jar is engineered for convenience and performance, ensuring meals are kept at optimal temperatures.
- Vacuum Insulation Technology: Keeps contents hot for up to 5 hours and cold for up to 7 hours.
- Kid-Friendly Design: Lightweight and compact with an easy-to-open push-button lid.
- Integrated Folding Spoon: A convenient spoon is stored securely within the lid.
- Durable Construction: Made with high-quality 18/8 stainless steel for everyday reliability.
- Wide Mouth: Facilitates easy filling, eating, and cleaning.
- BPA-Free Materials: Ensures safety for food contact.

Image: Key features and dimensions of the FUNtainer food jar, highlighting integrated spoon storage, leak-proof design, vacuum insulation, and BPA-free materials.

Image: A detailed view of the food jar's components, including the wide mouth opening, push-button lid, and integrated folding spoon.
Setup
Before first use, it is important to properly clean your new THERMOS FUNtainer food jar.
- Disassemble: Separate the lid from the body of the food jar. Remove the folding spoon from its storage slot.
- Wash: Wash all parts (food jar body, lid, and spoon) thoroughly with warm, soapy water.
- Rinse: Rinse all components completely to remove any soap residue.
- Dry: Ensure all parts are completely dry before reassembling or storing. This helps prevent odors and mildew.
Operating Instructions
Follow these steps to maximize the temperature retention of your food jar.
For Hot Foods:
- Preheat: Fill the food jar with hot tap water (not boiling). Secure the lid and let it stand for 5 to 10 minutes.
- Empty: Carefully empty the hot water.
- Fill: Immediately fill the food jar with your desired hot food.
- Seal: Securely fasten the lid. Ensure the push-button is in the closed position to prevent leaks.
For Cold Foods:
- Pre-chill: Fill the food jar with cold tap water or ice cubes. Secure the lid and let it stand for 5 to 10 minutes.
- Empty: Empty the cold water or ice.
- Fill: Immediately fill the food jar with your desired cold food.
- Seal: Securely fasten the lid. Ensure the push-button is in the closed position to prevent leaks.

Image: The food jar demonstrating its ability to keep food hot for 5 hours and cold for 7 hours.

Image: The food jar filled with hot soup, ready for transport.
Maintenance and Care
Proper care ensures the longevity and performance of your THERMOS FUNtainer food jar.
- Cleaning: The food jar is dishwasher safe, however, hand washing is recommended for best results and to preserve the finish.
- Hand Washing: Use warm water and mild dish soap. For thorough cleaning, use a bottle brush for the interior.
- Lid Care: The lid can be disassembled for cleaning. Pay attention to the gasket and ensure it is clean and properly seated after washing to prevent leaks.
- Avoid Abrasives: Do not use abrasive cleaners, scrubbers, or bleach, as these can damage the finish and insulation.
- Drying: Always allow all parts to air dry completely before reassembling or storing to prevent odors and mildew.

Image: THERMOS FUNtainer food jars placed in a dishwasher rack for cleaning.
Troubleshooting
If you encounter issues with your food jar, consider the following common solutions:
- Food Not Staying Hot/Cold:
- Ensure you are properly pre-heating or pre-chilling the jar before adding food.
- Verify the lid is securely tightened. A loose lid will compromise temperature retention.
- Avoid opening the lid frequently, as this allows temperature to escape.
- Lid Difficult to Open/Close:
- Check for any food debris or residue in the lid threads or on the gasket. Clean thoroughly.
- Ensure the silicone gasket is properly seated in its groove.
- Leaking:
- Confirm the lid is tightened completely and the push-button is in the closed position.
- Inspect the silicone gasket for any tears, cracks, or misalignment. A damaged or improperly seated gasket is a common cause of leaks.
Specifications
Feature | Detail |
---|---|
Model Number | F3100NY6 |
Capacity | 10 Ounces |
Material | Stainless Steel |
Color | Navy |
Dimensions (L x W x H) | 3.5" x 3.5" x 5.3" |
Item Weight | 4 ounces |
Insulation Type | Vacuum Insulated |
Hot Retention | Up to 5 hours |
Cold Retention | Up to 7 hours |
Care Instructions | Dishwasher Safe (Hand wash recommended) |
Included Components | Food jar with unfolding spoon |
Warranty and Support
THERMOS products are manufactured with quality and durability in mind. This product is backed by a limited warranty against defects in material and workmanship. For specific warranty details, to register your product, or for customer support, please visit the official THERMOS website or contact their customer service department directly. Keep your proof of purchase for warranty claims.
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