I tested it like this:
At 6:10pm I add hot water from the tap into the food jar, as this simple process warms up the jar, then lightly cover it with the lid (don't have to twist it on), while I start heating up my soup. At 6:30pm, I pour out the hot water and fill the jar with soup, close the lid, do a quick upside down test to assure no leaks, and pack it into my bag.
The spork the food jar comes with is small and kinda flat, honestly, I haven't used it at all. Instead, I take a spoon from my cupboard.
First lunch break is at 11:30pm. The soup is hot, like just off the stove hot. Cool it down before eating spoonfuls.
I save half of the soup for my next break at 2:30am, by this time, it's still hot but a nice, not burning hot.
Another time, I waited until my second break to eat from the food jar, so it was closed from 6:30pm to 2:30am, and it was hot like it had just been packed. I ate half and saved the rest of it for around 6:20am, while waiting for the bus outside in the cold, the soup was still nice and warm.
Once I get home, I soak the jar with warm soapy water for a couple hours before washing it, as it helps to clean out the smells and any dried on bits of food. Do not forget the food flask, closed up in your bag, for hours or until the next day, I know someone who does this, it's gross, and especially when there's still a lot of food left in it. The jar will release a rotten smell, or be no longer safe to open. As with most vacuum sealed food jars, do what the instructions say.
If you need a food jar that will keep food good and hot for more than 6/7 hours, get the 18oz over the slightly smaller size. The 18oz will hold an entire 540ml can of Chunky soup just up to the fill line; of course, watch it doesn't go passed that, otherwise the jar will leak.
| Product Dimensions | 11.43 x 11.43 x 17.53 cm; 250 g |
|---|---|
| Item model number | 10-01287-031 |
| Cap Type | Screw Cap |
| Colour | Stainless Steel |
| Size | Large |
| Style | 18 oz |
| Width | 4 inches |
| Material | Other |
| Number of Items | 1 |
| Number of Pieces | 1 |
| Special Features | Durable, rust free, Dishwasher Safe |
| Included Components | jar, spork, lid |
| Batteries Included? | No |
| Brand | Stanley |
| Item Weight | 250 g |
