There are hardly any alternative passive coolers that make such consistent use of maximum insulation. I tested the Qool Box M with different Temperature Elements and ice cubes and I have to say that I am really impressed. The box has great handling due to its low weight. Also, due to the extreme insulation performance, it can be used for several days. That makes you more independent.
Click here for the full test report.
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QOOL Box M with 4 Temperature Elements
Without power supply
Keeps the temperature constant up to 10 days
Made in Germany