---
product_id: 47892551
title: "Thermos Blue Kids/Boys Lunch Food Flask (290ml) 5h Hot | 7h Cold"
brand: "thermos"
price: "¥7256"
currency: JPY
in_stock: true
reviews_count: 13
category: "Thermos"
url: https://www.desertcart.jp/products/47892551-thermos-blue-kids-boys-lunch-food-flask-290ml-5h-hot
store_origin: JP
region: Japan
---

# 5h hot retention 7h cold retention Durable stainless steel Thermos Blue Kids/Boys Lunch Food Flask (290ml) 5h Hot | 7h Cold

**Brand:** thermos
**Price:** ¥7256
**Availability:** ✅ In Stock

## Summary

> 🥶🔥 Keep it fresh, keep it cool — lunch that’s always on point!

## Quick Answers

- **What is this?** Thermos Blue Kids/Boys Lunch Food Flask (290ml) 5h Hot | 7h Cold by thermos
- **How much does it cost?** ¥7256 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/47892551-thermos-blue-kids-boys-lunch-food-flask-290ml-5h-hot)

## Best For

- thermos enthusiasts

## Why This Product

- Trusted thermos brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Brave the Day:** Rugged stainless steel construction resists drops and spills while staying cool to the touch.
- • **Effortless Clean & Fill:** Wide mouth design makes packing, eating, and cleaning a breeze—more time for what matters.
- • **Kid-Approved & BPA Free:** Safe, leakproof, and designed specifically for kids’ lunches—because their health comes first.
- • **All-Day Temperature Control:** Keeps meals hot for 5 hours or refreshingly cold for 7 hours—perfect for busy school days.
- • **Trusted Thermos Reliability:** Backed by legendary performance and 5 years of spare part availability for peace of mind.

## Overview

The Thermos Blue Kids/Boys Lunch Food Flask (290ml) features double-wall vacuum insulation that maintains hot food for up to 5 hours and cold food for up to 7 hours. Crafted from durable stainless steel, it’s designed to withstand everyday kid-powered adventures while staying leakproof and BPA free. Its wide mouth ensures easy filling and cleaning, making it the ultimate lunch companion trusted by parents and kids alike.

## Description

From the manufacturer

Review: Must have item! - We are a family of 5 and I have bought several of these thermoses. I couldn’t be without them now. I have tried many alternatives on the market and they do not compare to this one. This one does not leak, it keeps the food very hot (can be extremely hot and kids need to be careful), it’s a great size to pack into lunchboxes or bags and they come in a variety of different designs/colours. They’re great for the kids to take to school so they can have a hot dinner - this is great as mine are fussy eaters and won’t entertain school lunches. We have taken them away on breaks we have had where we go out for long days. And unfortunately our children can be in hospital a lot for various health reasons - these allow me to take them a proper meal when they’re sick of cold food. They can hold a surprising amount of food. More than enough for a little child but also a decent sized adult portion. They are sturdy. They have been dropped several times by kids and they are really tough and can take it. They’re easy to wash - if you’ve had something in it that can leave a residue like curry, just boil some water and let them soak in it with some fairy liquid to get rid of the taste for next time. They are great value for money considering how long they last and how often they’re used in this family. It’s a kitchen staple we couldn’t be without now. I will definitely be repurchasing more in the future.
Review: I now have 4 of these !!!! - I was sceptical as they are expensive for a small flask but a friend reccommended this type and, as I have tried others which are either too big for or don't keep food hot all morning, I thought I would give these a go. Initially I bought 2 of these so the children could have hot meals at school for a change without the risk of 'today's special' in the canteen being on the 'don't like' list. I always pre-heat them with boiling water at 7am for 10 mins while I heat the food and let it boil well so that I know it is as hot as i can get it. In it goes, full to the brim and lids on. The 10 year old has lunch at 12, the 14 year old at 1pm. They both report that at lunchtime(after 5 and 6 hours) the food is hot, though not burning. Pretty impressive!! (incidentally i wondered if the lid would be difficult to open but the 10 year old reports it not so... bet he wouldn't have managed it at 5 though!!) They have rapidly become my receptical of choice for reheated dinner left overs (you know those times when there is not enough bolognaise left for another dinner but too much for the bin...add some more veg and tomato sauce and lunch is made!!) Then my husband started using one to take porridge on days when i wasn't using them for the children. Then when he has to work late he dicided to take a hot lunch and a cold dinner. The tub is a smaller portion than he would normally eat but works well with a bread roll and banana with it. Then we took hot lunches for the kids on a satuday hike in the snow and they scoffed them mercilesly while we only had a flask of hot tea with our sandwiches. So i bought 2 more flasks. I find they work best with food that is slightly more liquid than normal (eg add some extra tomato sauce to bolognaise) and chopped small so there are no air gaps in the pot (use small pasta shapes and chop carrotts into dice rather than pennies!!) Our favourite 'hot pot meals' are bolognaise with space pasta (some supermarkets stock the shapes!) chicken and vegetable casserole sausage, pasta and veg in tomato sauce creamy chicken pasta sausages and baked beans soup (i tend to put in a really thick one) they are also the right size for those mug sized packets past like mugshots. Just preheat the jar, add the packet, fill with boiling water stir well and they are soft and have absorbed the water at lunchtime... handy for camping I have steered clear of rice in it... not sure about the food safety implications keeping reheated rice hot for 6 hours ??? yes thay are expensive but... It is cheaper to buy vegetables than fruit so a carrot & sweetcorn in the hot pot is a cheaper way to 5 a day in the packed lunch than an apple and grapes!! Dinner left overs are no longer wasted! If they take the place of buying school lunches and more significantly motorway service station meals they pay for themselves very quickly!!

## Features

- Keeps Food Just Right: Double-wall vacuum insulation keeps your child’s lunch hot for up to 5 hours or cold for 7 hours, so their meal stays fresh and at the perfect temperature all day long.
- Built to Last: Made with tough, high-quality stainless steel inside and out, this flask can handle drops, spills, and everyday use. Plus, it stays cool to the touch even with hot food inside, and won’t sweat when filled with cold treats.
- Hassle-Free Cleanup: The wide mouth makes it easy to fill, eat from, and clean, saving you time in the morning and making after-school cleanup a breeze.
- Trusted Thermos Quality: Crafted with the legendary Thermos performance you can count on, this flask is lunchtime ready and ensures long-lasting reliability for years of school lunches.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004DGJLWU |
| Age Range Description | Kid |
| Age range (description) | Kid |
| Best Sellers Rank | 2,912 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 7 in Insulated Food Jars |
| Brand | Thermos |
| Brand Name | Thermos |
| Cap Type | Screw Cap |
| Capacity | 290 ml |
| Colour | Blue |
| Country Of Origin | China |
| Customer Reviews | 4.5 out of 5 stars 3,218 Reviews |
| EU Spare Part Availability Duration | 5 Years |
| Global Trade Identification Number | 05010576569028 |
| Included Components | Food Flask |
| Is the item dishwasher safe? | No |
| Is the item microwaveable? | No |
| Item Dimensions W x H | 44W x 35H millimetres |
| Item Type Name | Food Flask |
| Item Weight | 0.24 Kilograms |
| Manufacturer | Thermos |
| Material Type | Stainless Steel |
| Model Name | f300 |
| Number of Items | 1 |
| Pattern | Single |
| Product Care Instructions | Hand Wash Only |
| Recommended Uses For Product | Fruit Salad, Kids Dinners, Pasta, Rice, School Lunch, Soup |
| Recommended uses for product | Fruit Salad, Kids Dinners, Pasta, Rice, School Lunch, Soup |
| Special Features | BPA Free, Cold 7 Hours, Durable Stainless Steel, Hot 5 Hours, Leakproof, Vacuum Insulated |
| Special feature | BPA Free, Cold 7 Hours, Durable Stainless Steel, Hot 5 Hours, Leakproof, Vacuum Insulated |
| Unit Count | 1.0 count |
| With Lid | Yes |

## Product Details

- **Brand:** Thermos
- **Capacity:** 290 ml
- **Colour:** Blue
- **Recommended uses for product:** Fruit Salad, Kids Dinners, Pasta, Rice, School Lunch, Soup
- **Special feature:** BPA Free, Cold 7 Hours, Durable Stainless Steel, Hot 5 Hours, Leakproof, Vacuum Insulated

## Images

![Thermos Blue Kids/Boys Lunch Food Flask (290ml) 5h Hot | 7h Cold - Image 1](https://m.media-amazon.com/images/I/61Bn2ZVE1aL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Does anyone else’s flask seem to lose heat through the lid? It seems to get quite warm**
A: Not that I’ve really noticed but you have to make sure the flask is hot inside ( ie boiling water) before you put your food in to ensure it stays hot.

**Q: How tall is this item?**
A: It's about 12 cm tall

**Q: Is this dishwasher safe?**
A: The manufacturer says not to put in the dishwasher. 

I read a review by someone else that said the flask was not retaining its heat as much as it used to and they suggested it was because they had put it in the dishwasher.

 I always do it by hand and it is still working well. The wide neck means it’s easy to get a sponge or brush in there and get all the 90 degree angles (base & shoulders).

DD much happier to take leftovers to school than boring old sandwiches every day.

**Q: Hi there, I purchased this item on the 6th Nov and the seal inside the lid has broken. Is possible to have a replacement part?**
A: No idea try the actual firm via checking on the webb

## Customer Reviews

### ⭐⭐⭐⭐⭐ Must have item!
*by T***I on 7 March 2023*

We are a family of 5 and I have bought several of these thermoses. I couldn’t be without them now. I have tried many alternatives on the market and they do not compare to this one. This one does not leak, it keeps the food very hot (can be extremely hot and kids need to be careful), it’s a great size to pack into lunchboxes or bags and they come in a variety of different designs/colours. They’re great for the kids to take to school so they can have a hot dinner - this is great as mine are fussy eaters and won’t entertain school lunches. We have taken them away on breaks we have had where we go out for long days. And unfortunately our children can be in hospital a lot for various health reasons - these allow me to take them a proper meal when they’re sick of cold food. They can hold a surprising amount of food. More than enough for a little child but also a decent sized adult portion. They are sturdy. They have been dropped several times by kids and they are really tough and can take it. They’re easy to wash - if you’ve had something in it that can leave a residue like curry, just boil some water and let them soak in it with some fairy liquid to get rid of the taste for next time. They are great value for money considering how long they last and how often they’re used in this family. It’s a kitchen staple we couldn’t be without now. I will definitely be repurchasing more in the future.

### ⭐⭐⭐⭐⭐ I now have 4 of these !!!!
*by K***K on 3 March 2014*

I was sceptical as they are expensive for a small flask but a friend reccommended this type and, as I have tried others which are either too big for or don't keep food hot all morning, I thought I would give these a go. Initially I bought 2 of these so the children could have hot meals at school for a change without the risk of 'today's special' in the canteen being on the 'don't like' list. I always pre-heat them with boiling water at 7am for 10 mins while I heat the food and let it boil well so that I know it is as hot as i can get it. In it goes, full to the brim and lids on. The 10 year old has lunch at 12, the 14 year old at 1pm. They both report that at lunchtime(after 5 and 6 hours) the food is hot, though not burning. Pretty impressive!! (incidentally i wondered if the lid would be difficult to open but the 10 year old reports it not so... bet he wouldn't have managed it at 5 though!!) They have rapidly become my receptical of choice for reheated dinner left overs (you know those times when there is not enough bolognaise left for another dinner but too much for the bin...add some more veg and tomato sauce and lunch is made!!) Then my husband started using one to take porridge on days when i wasn't using them for the children. Then when he has to work late he dicided to take a hot lunch and a cold dinner. The tub is a smaller portion than he would normally eat but works well with a bread roll and banana with it. Then we took hot lunches for the kids on a satuday hike in the snow and they scoffed them mercilesly while we only had a flask of hot tea with our sandwiches. So i bought 2 more flasks. I find they work best with food that is slightly more liquid than normal (eg add some extra tomato sauce to bolognaise) and chopped small so there are no air gaps in the pot (use small pasta shapes and chop carrotts into dice rather than pennies!!) Our favourite 'hot pot meals' are bolognaise with space pasta (some supermarkets stock the shapes!) chicken and vegetable casserole sausage, pasta and veg in tomato sauce creamy chicken pasta sausages and baked beans soup (i tend to put in a really thick one) they are also the right size for those mug sized packets past like mugshots. Just preheat the jar, add the packet, fill with boiling water stir well and they are soft and have absorbed the water at lunchtime... handy for camping I have steered clear of rice in it... not sure about the food safety implications keeping reheated rice hot for 6 hours ??? yes thay are expensive but... It is cheaper to buy vegetables than fruit so a carrot & sweetcorn in the hot pot is a cheaper way to 5 a day in the packed lunch than an apple and grapes!! Dinner left overs are no longer wasted! If they take the place of buying school lunches and more significantly motorway service station meals they pay for themselves very quickly!!

### ⭐⭐⭐⭐⭐ Great size and keeps food nice and hot
*by E***L on 21 October 2026*

Great little food flask, keeps my daughters lunch hot until lunch, ideal size for a child’s lunch.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-11-07*