Thermos Lunch Box (1000ml)

Thermos Lunch Box (1000ml)

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£49.99
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Thermos Lunch Box (1000ml)

Thermos Lunch Box (1000ml)

£49.99
£49.99
SAVE Sold out

Pour in boiling water and rice, come back to porridge — no stove, no power

Double-wall vacuum insulation keeps food hot for 6–12 hours, and the retained heat is strong enough to actually cook rice into porridge with nothing but boiling water and time. Backed by a 30-day return window.

  • Double-wall vacuum insulation holds food hot or cold for 6–12 hours
  • Food-grade, BPA-free stainless steel interior and exterior — dent-resistant and built to last
  • Wide mouth opening makes filling and cleaning straightforward
  • Doubles as a passive cooker: pour in boiling water with rice, seal, and it slow-cooks into porridge over a few hours with no stove or power
  • 1000ml capacity — enough for a real meal, not just a snack portion

Specifications

Spec Detail
Material Food-grade stainless steel, BPA-free
Capacity 1000ml
Insulation time 6–12 hours
Bottom diameter 11.5cm
Height 19.2cm
Colours Silver, Rose Red, Gold, Blue

Frequently asked questions

➤ How long does it actually stay hot?

6–12 hours, depending on what's inside and the starting temperature.

➤ Can it really cook food without a stove?

Yes — for something like porridge, preheat the flask with boiling water, drain it, add rinsed rice, pour in fresh boiling water, seal, and leave for around 4 hours. The retained heat finishes the cooking.

➤ Is it food safe?

Yes, food-grade stainless steel construction, BPA-free.

➤ How do I clean it?

The wide-mouth opening makes it easy to reach inside for cleaning.

➤ What sizes and colours are available?

1000ml capacity, available in Silver, Rose Red, Gold and Blue.

➤ What if it's not the right fit for me?

Backed by a 30-day return window, no questions asked.

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Return Policy

Please inspect your order upon arrival. If your item arrives damaged, defective, incorrect, or does not meet your expectations due to a manufacturing issue, contact us at support@rationalsteel.com within 30 days of delivery, and we'll be happy to assist you.

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Verified Reviews

  • “Very happy with this. It doesn't feel cheap or flimsy like some of the alternatives I've tried, and everything was finished properly. For the price, I think it's excellent value.”

    SOPHIE BENNETT (Verified)

  • “I wasn't sure whether to order online as there were cheaper options around, but I'm glad I did. The quality is noticeably better than I expected and it actually does what it's supposed to. I'd happily buy from Rational Steel again.”

    SANDY MILLER (Verified)

  • “Ordering was straightforward, it arrived safely and it's was exactly what I was hoping for. I've been using it regularly and it's held up really well so far. Would definitely order again.”

    DANIEL MORRIS (Verified)

  • “Bought this for a specific job and wasn't sure how often I'd actually use it. Turns out I've already used it several times. One of those purchases that just makes things a bit easier.”

    NATHAN BROWN (Verified)

  • “I honestly wasn't expecting much at first, especially at the price, but I was pleasantly surprised when it arrived. It feels solid, looks well finished and has been genuinely useful. Glad I went for it.”

    JAMES WALKER (Verified)

  • “I've had a few disappointing online purchases before, so I was a little hesitant ordering. This arrived exactly as shown, was packaged properly and feels like good quality. No complaints from me.”

    ALEX MAZUEL (Verified)

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    Test every product against one standard: it works, and keeps working.

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