Outdoor Monster Test: QOOL Box M Eco+ impresses in the summer heat without electricity

Summer, camping, road trip—and the question remains: How do you reliably keep food and drinks cold on the go? The well-known outdoor blog Outdoormonster has extensively tested our QOOL Box M Eco+. The result: A high-tech cooler that consistently cools even in the summer heat—all without electricity.

Practical test in the Hamburg summer

The outdoor monster test took place at daytime temperatures of up to 28 ° C and at night at 18 ° C. The box was placed in the shade on the terrace and was opened several times a day to take out drinks.

During the test, the internal temperature of the QOOL Box M Eco+ remained constant at around +5°C for the first five days – the drinks were ice-cold, and there were no temperature spikes, even with frequent opening of the box. From days 6 to 7, the contents warmed only slightly to around +7°C, but remained pleasantly cool. Only on day 8 did the PCM elements begin to gradually lose their temperature, but even then, the contents were still significantly cooler than the ambient air.

High-tech cooling instead of ice cubes

The QOOL Box Eco+ cools differently: instead of ice cubes, it uses PCM (Phase Change Material) cooling elements. This means consistent temperatures, no melting water, and dry food – perfect for on the go or when transporting delicate items.

Three temperature ranges for every application:

• FRESH (+2 to +8 °C): ideal for medicines or sensitive foods
• COOL (–2 to +2 °C): for normal refrigerator foods
• FROZEN (–15 to –20 °C): for frozen food

The combination of vacuum insulation panels and EPP foam keeps the cold even when the box is opened frequently.

Conclusion: The perfect solution for self-sufficient cooling

The QOOL Box M Eco+ is the premium solution for those who want to be self-sufficient on the go. Thanks to its PCM elements, it keeps food and drinks consistently cool for up to 10 days – without electricity, generator, or compressor.

"The cooling performance is outstanding, the workmanship is top-notch, and the concept without meltwater is convincing."
– Axel Telzerow, OutdoorMonster 2025 ( Link to article )

👉 You can find the full review from Outdoormonster here: QOOL Box M Eco+ in review: The high-tech cooler without electricity

Note: The information presented is based on the independent test of the QOOL Box M Eco+ by Outdoormonster.de, which documented the cooling performance and innovation of the box.