An insulated food jar is a wide-mouth vacuum bottle made for soup, pasta and leftovers. The mouth is wide enough for a spoon, and the lid is meant to stay closed in a bag. Size, lid style and whether a spoon is included decide which one fits your lunch.
The six jars below range from 16 ounces to 47 ounces. Capacities, lids and hold times come from each product’s listing page, and the hold times are the makers’ own figures. We have not used these jars ourselves.
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What to Look For
| Feature | Why it matters |
|---|---|
| Size | 16 oz suits a bowl of soup; 32 oz and up suits sharing |
| Lid | Screw-on, push-button and bowl lids work differently |
| Spoon | Built-in, folding or included spoons save carrying one |
| Cleaning | Dishwasher notes differ between listings |
Specs at a Glance
| Jar | Capacity | Lid and extras | Maker’s hold times |
|---|---|---|---|
| THERMOS Stainless King 24 oz | 24 oz | Lid doubles as a serving bowl | Hot up to 14 hours; cold up to 24 hours |
| THERMOS Stainless King 47 oz | 47 oz (1.4 L) | Handle; two 20 oz plastic containers | Hot up to 10 hours; cold up to 24 hours |
| THERMOS FUNTAINER 16 oz | 16 oz | Push-button lid with a foldable spoon in the lid | Hot up to 7 hours; cold up to 9 hours |
| STANLEY Adventure To-Go 18 oz | 18 oz | Wide-mouth screw-on lid; spork included | Not given in the text we read |
| Amazon Basics 16 oz | 16 oz (473 ml) | Screw-on lid with carry handle | Hot 8 hours; cold 12 hours |
| Itslife 32 oz | 32 oz | Two inner compartments; hidden folding spoon; silicone base | Hot 6 hours; cold 8 hours |
The 6 Best Thermos Food Jars
1. THERMOS Stainless King Vacuum-Insulated Food Jar, 24 Ounce
A 24 ounce 18/8 stainless steel jar whose insulated lid doubles as a built-in serving bowl. The listing says the exterior stays cool with hot contents, and it comes in 16 and 47 ounce sizes too.
Suits: a big bowl of soup. Strengths: a lid that becomes a bowl and a long hold time. Weaknesses: no spoon listed. Skip it if you need a built-in spoon.
View THERMOS Stainless King Vacuum-Insulated Food Jar, 24 Ounce, Matte Black on Amazon
2. THERMOS Stainless King Food Jar with Handle, 47oz
A 47 ounce (1.4 liter) steel jar with a carry handle that comes with two 20 ounce plastic containers. The listing mentions a pressure relief stopper and top-rack dishwasher cleaning.
Suits: sharing or a big meal. Strengths: a handle and two inner containers. Weaknesses: large and heavy to carry. Skip it if you pack a single serving.
View THERMOS Stainless King Food Jar with Handle, 47oz, Matte Stainless Steel on Amazon
3. THERMOS FUNTAINER Food Jar with Spoon, 16oz
A 16 ounce kid-oriented stainless steel jar weighing about 8 ounces, with a push-button lid and a foldable spoon built into the lid. The listing recommends hand washing, though it calls the jar dishwasher safe.
Suits: a school lunch. Strengths: light, with the spoon attached. Weaknesses: the shortest hold times here. Skip it if you want hours of heat.
View THERMOS FUNTAINER Food Jar with Spoon, 16oz, Matte Charcoal on Amazon
4. STANLEY Adventure To-Go Food Jar, 18 oz
An 18 ounce vacuum-insulated stainless steel jar with a wide mouth, a screw-on leakproof lid and a spork. The listing calls it dishwasher safe and packable for travel.
Suits: hiking or an office lunch. Strengths: a spork and a wide mouth. Weaknesses: no hold times in the text we read. Skip it if you need stated hot hours.
View STANLEY Adventure To-Go Food Jar, 18 oz, Frost on Amazon
5. Amazon Basics Insulated Food Jar, 16 Ounces
A 16 ounce stainless steel jar, 3.7 by 3.7 by 6.49 inches, with a wide opening, a screw-on leakproof lid and a built-in carry handle. The maker lists 8 hours hot and 12 hours cold, and dishwasher safe care.
Suits: a single serving of soup. Strengths: a handle and clear hold times. Weaknesses: a plastic lid. Skip it if you want a lid that doubles as a bowl.
6. Itslife 32oz Insulated Soup Thermo
A 32 ounce vacuum jar, 4.72 by 4.72 by 5.11 inches, with inner compartments for layered foods, a hidden folding spoon and a silicone pad on the base. The maker lists 6 hours hot and 8 hours cold.
Suits: a large lunch with two foods. Strengths: compartments and a spoon. Weaknesses: shorter hold times. Skip it if you want one open cavity.
Care and Setup
- Fill the jar with hot or cold water for 5 to 10 minutes before use, as Thermos suggests.
- Check each listing for dishwasher or hand wash care.
- Close the lid fully before packing it in a bag.
- Pick a wide-mouth jar for chunky foods.
Mistakes to Avoid
- Skipping the pre-heat or pre-chill step.
- Choosing a size far bigger than the meal.
- Assuming every hold time is measured the same way.
- Putting a hand-wash part in the dishwasher.
Food Jar FAQ
How long do they keep food hot?
The makers list 6 to 14 hours of heat depending on the jar. Those are their own figures and vary by model.
Do they include a spoon?
The FUNTAINER, Stanley and Itslife do. The Stainless King jars and the Amazon Basics listing do not mention one.
The Short Version
For a lid that becomes a bowl, the Stainless King 24 oz. For sharing, the 47 oz with a handle. For a kid’s lunch, the FUNTAINER. For hiking, the Stanley. For a plain handle jar, the Amazon Basics. For two foods in one jar, the Itslife.
