U-Konserve
Insulated Food Jar / Hot & Cold
Best plastic-free container for eco-conscious commuters needing temperature-controlled lunches.
Enjoy your meals at the perfect temperature with this 12oz insulated food jar. Crafted from durable stainless steel, it features an all-stainless steel interior for safe, non-toxic food storage. Advanced TriMax® triple insulation and a Reflecta™ insulated lid keep food hot for up to 5 hours or cold for at least 8 hours. Its leak-proof and airtight design prevents spills, while the exterior remains condensation-free. This reusable jar is ideal for transporting homemade meals, reducing waste and promoting a zero-waste lifestyle.
$19.99
Owner Satisfaction
4.6
/ 5
Category Rank
306
/ 987
#306 in Thermoses
Price vs Category Average
-62%
Below average
Capacity
12
/ oz
Who it's for
- Busy professionals wanting easy-to-clean containers for chunky meals
- Commuters needing meals to stay hot or cold until lunch
- Health-conscious parents prioritizing non-toxic, plastic-free food storage
Who should skip it
- Busy households relying exclusively on dishwasher convenience
- Commuters carrying heavy bags who prioritize lightweight gear
- Hungry individuals needing maximum food volume in a compact size
Performance breakdown
Thermal Retention
Triple insulation keeps soups hot and salads crisp for your commute.
Build Quality
Rugged stainless steel construction ensures this jar survives daily wear.
Leak Resistance
Airtight seal provides total peace of mind inside your work bag.
Material Purity
Plastic-free interior eliminates concerns about chemical leaching into your lunch.
Ease of Cleaning
Hand-wash requirement is a minor trade-off for such durable construction.
Portability
Compact 12oz size fits perfectly into most standard lunch totes.
Key Specs
Capacity
12 oz
Insulation
TriMax® triple insulation
Lid Feature
Reflecta™ insulated lid
Exterior Material
304 (18/8) stainless steel
Interior Material
Plastic free (stainless steel)
Lid Components
Silicone seal and PP#5 plastic rim (not food contact)
Dimensions
5" x 3.5"
Hot Retention
Up to 5 hours
Features
- Maintains food temperature for hours
- Reduces single-use waste
- Durable, high-quality construction
- Airtight and leak-proof seal
- Plastic-free interior
- Exterior stays condensation-free
- Ideal for on-the-go meals
What customers say
Consumers consistently praise the U Konserve food jar for its exceptional reliability, noting that it maintains desired temperatures for hours, making it a trustworthy choice for school or work lunches. The high quality stainless steel construction receives high marks for durability and feeling substantial. Users appreciate the wide mouth design which significantly improves ease of use for both filling and cleaning. While the price point is sometimes mentioned, the perceived longevity and performance solidify its strong value proposition.
Know before you buy
Yes, the interior of the jar is made entirely of high-quality stainless steel, ensuring no plastic comes into contact with your food.
No, this jar is not dishwasher safe. We recommend hand washing it with warm, soapy water to maintain the integrity of the vacuum insulation and the finish.
The TriMax® triple insulation keeps food hot for up to 5 hours and cold for at least 8 hours, depending on the starting temperature and how often the lid is opened.
Yes, the jar features an airtight, leak-proof screw-top design with a silicone seal, making it safe to carry in a bag without worrying about spills.
No, the vacuum-insulated construction ensures the exterior remains condensation-free, even when storing cold items.
The PP#5 plastic rim is located on the exterior of the lid and does not come into contact with your food. It is used to provide a secure grip and structural support for the screw-top closure.
Still have a question?
Ask Hayley anything about this product before you decide.