how do I get the plastic gasket seal that was attatached to lid? lost mine somehow

As of fall of 2016 they were still offering the gaskets. I think I just sent 5 bucks and asked them to send as many gaskets as that would buy. They sent 3 - but not just the gasket but the entire plastic lid as well.

How long many hours will the Thermos keep contents warm? I need to warm the soup, etc and then pack it in a lunch.

Soup and stews stay hot for a long time. I leave to work at 5:30am and have lunch around 1, and it is always hot. When it comes to food that is not liquid or in sauce, like baked fish and veg, it is still warm 7-8 hours later, but not as much as soup and liquids which stay very hot for hours.

I can't decide between two Thermos 16-ounce food jars - the Stainless Steel King or the Stainless Steel food jar (plum or teal colored). Any recommendations on which is better ?

I have the Thermos King and the Thermos Nissan food container, both 16 oz. I don't think you can go wrong with either. Both do a great job of keeping products cold/hot. The Thermos King is a little shorter and wider and the Nissan is slightly taller and narrower. The Thermos King has the lid for the jar (with the fold up spoon) and a stainless steel cap that goes over the lid. The Nissan just has the plastic lid for the jar. The King looks like it might be more insulated (?-guessing here just by the looks and the weight). I have the midnight blue Thermos King and it's a nice color, almost black with a hint of the blue under the light. The Nissan is all stainless steel with a black cap. Regarding the SS Food Jar (plum or teal) I can't say specifically since I do not own this version however, comparing the 2 products I think I would go with the King because it of the 2 lids/caps and the spoon and might be more insulated. The food jar keeps hot for 7 hours and cold for 9 hours. The Thermos King keep food hot for 9 hours and cold for 12 hours.

Is it easy enough for a small child to open it?

The children’s thermoses are easily opened by my kids when they were as young as 6. I didn’t have them when they were 5. But this one would be tougher for a young 6 year old. My 8 year old can do it, and my nearly 7 year old can, also. But the kid ones are easier and you do need to be sure not to tighten them too much for younger kids. We use them weekly and my kids haven’t asked me to open theirs in a long time.

Product dimensions	9.4L x 9.4W x 7.6H centimeters
Recommended uses for product	Camping
Special features	Alcohol-Free
Container shape	Round
Closure type	Screw Top
Is dishwasher-safe	No
Material type free	BPA Free
Item package quantity	1
Item weight	0.5 Pounds
Product care instructions	Dishwasher Safe
Item volume	16 Fluid Ounces
Unit count	15.8 Ounce
Is microwaveable	No
Item form	Jar
Manufacturer	THERMOS LLC
Number of Items	1
Size	16 Ounce
Global Trade Identification Number	00041205628309
UPC	041205628309
Model Number	SK3000MBTRI4
Color	Red
Special Features	Alcohol-Free
Item Weight	227 g

Stainless King Vacuum-Insulated Food Jar with Spoon, 16 Ounce, Midnight Blue

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