I've had the same 4 thermos for about 15 years. Time to replace them. Am curious if they keep the foot hot (!!) once you warm up container & food?

I put boiling water in the container with lid on while I'm cooking lunch in the morning. Then dry it out (the metal will be very hot to touch) and put the hot lunch in. My daughter tells me her lunch is hot when she eats it at school every day. I think it holds the heat very well from her comments. I cook her lunch about 7:00am and she eats lunch at 11:30am.

Will it fit the kids sized hydro flask lunchbox?

It fit easily into my grandchildren's lunch boxes. However, they had the soft shell fabric lunch boxes. I don't know about the hard shell lunch boxes typically used by younger children.

Is this a good size for a toddler? The one I have is too deep for my two year

I would say no. It is pretty deep for a toddler. My daughter is in high school it is better for an older child in my opinion

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🥄 Hot or cold, fun unfolds – lunch just got an upgrade!

EFFORTLESS CLEANING - Wide mouth design and dishwasher-safe build make cleanup a breeze, so you can spend less time washing and more time living.
KID APPROVED DESIGN - Lightweight, compact, and featuring a push-button lid, this jar is easy for little hands to open and carry with confidence.
SPOON ALWAYS ON HAND - Integrated collapsible spoon in the lid means no more forgotten utensils—lunch just got effortlessly stylish and practical.
DURABILITY THAT LASTS - Crafted from premium 18/8 stainless steel, this jar withstands daily drops and dents, built to keep up with your child’s active lifestyle.
ALL DAY TEMPERATURE LOCK - Vacuum insulation technology keeps meals hot for 5 hours or cold for 7 hours, perfect for busy school days or on-the-go lunches.

The THERMOS FUNTAINER 10oz Pink insulated food jar uses advanced vacuum insulation to keep food hot for up to 5 hours and cold for up to 7 hours. Designed specifically for kids, it features a lightweight, compact build with a push-button lid and an integrated foldable spoon for convenience. Made from durable 18/8 stainless steel, it’s built to withstand everyday use and is easy to clean with a wide mouth and dishwasher-safe design. Trusted since 1904, Thermos ensures your child’s meals stay fresh, sealed, and ready to enjoy.

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Manufacturer	Thermos
Model Number	F3100PK6
Package Dimensions	16.9 x 13.6 x 10.4 cm
Material	Stainless Steel
Color	Pink
Volume	295 Milliliters
Size	10オンス
Special Features	Thermal Insulated
Package Weight	0.27 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash Only
Brand Name	サーモス(THERMOS)
Capacity	283 g
Item Weight	0.25 Pounds

THERMOS FUNTAINER Insulated Food Jar - 10oz Pink - Kids Friendly Thermos Food Jar with Foldable Spoon

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