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Coolers

Chilled food and drinks for 12 days without electricity

Whether balcony, festival or wilderness

Wide range of accessories for limitless application possibilities

Cooler box

Description

Experience 12 days of intense Adventure without electricity. Whether camping, on the boat, or in your own garden, your drinks and food stay cool for up to 12 days. Extremely durable, versatile, and perfect for on the go. Cold drinks whenever and wherever you want – with no compromises.

199,00 €
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Coolers

Why Petromax?

  • Person öffnet eine Kühlbox mit frischem Gemüse

    Garden parties, BBQs and chill-out zones

    The Petromax cool boxes are ideal for cozy days in your own garden. With its intelligent insulation system, which achieves wall thicknesses of up to 6.5 cm, it keeps your drinks and snacks cool without any electricity - the perfect mini fridge for the garden! With a capacity of 50 liters or more, it even offers enough space for a whole crate of drinks, fresh vegetables and much more. Thanks to the convenient drain valve, you can easily drain melt water, and the sturdy construction also allows the cool box to be used as additional seating at garden parties.

  • Boat trips and fishing adventures

    The Petromax cool boxes are an indispensable companion for passionate anglers. Their ultra-sturdy design ensures durability and safety on the boat, while the additional recesses for lashing straps enable secure fastening. Whether it's freshly caught fish or food for the day - the cool box keeps everything perfectly chilled, even in rough conditions on the water. So you can concentrate fully on your fishing experience!

  • Kühlrucksack im Kofferraum eines Geländewagens

    Camping, festivals and road trips

    The Petromax cool boxes are your best friend on camping trips, festivals and road trips. With their ability to cool for up to 12 days without electricity, you are completely independent and can concentrate on the important things in life. With a capacity of 25 or 50 liters, it offers enough space for everything you need, and the ergonomic design makes it super easy to transport. Easy to clean and extremely robust, the cool boxes are the perfect addition to any outdoor adventure.

Accessories coolers

Frequently asked questions about Coolers

What is a passive cooler?

A passive cool box, often referred to as a cool box without electricity, is an insulated container that keeps food and drinks cool without relying on an external power source.

The principle is very simple! Before use, the cool box is filled with ice packs or ice cubes. These ensure a low internal temperature, which is maintained for as long as possible thanks to the box's high-quality insulation. Passive cool boxes are the perfect companion for anyone who values flexibility and independence, whether camping, picnics or other outdoor activities.

How does a passive cooler work?

A passive cool box is basically an insulated container designed to keep the temperature inside stable. This works according to the following principles:

Insulation: The walls of a passive cool box consist of one or more layers of insulating material, such as polyurethane or polystyrene. These materials are poor heat conductors and effectively prevent heat from entering the cool box from the outside or cold from escaping from the inside.

Cold packs or ice: Before filling the cool box, place cold packs or ice inside. These serve as a source of cold and lower the temperature inside the box.

Heat exchange: The cold from the ice packs is slowly released into the food and drinks. At the same time, the heat from outside tries to penetrate the cool box. The insulation slows down this process considerably so that the contents remain cool for a longer period of time.

Phase transition: When ice melts, it absorbs heat from its surroundings. This phase transition from ice to water traps heat and helps to keep the temperature inside the cool box low.

Put simply, a passive cool box works like a thermos flask, but for larger quantities. The insulation keeps the cold in and the heat out, so your food and drinks stay fresh for longer!

Passive vs. active cooler: Which one is right for me?

The choice between passive and active cooling depends on your individual needs. Passive coolers like those from Petromax offer you complete independence from the power grid and are ideal for remote campsites. They operate completely silently and only require ice or cooling packs as an energy source.
Active coolers, on the other hand, provide constant temperatures but need a power source. For a detailed comparison of all systems, we recommend our guide on active vs. passive coolers.

What characterizes a passive cooler?

Passive coolers are characterized by their ease of use and versatility. Unlike electric coolers, they do not require a power connection and can therefore be used anywhere. The high-quality insulating materials from which they are made ensure that the cold is stored for as long as possible. In addition, passive cool boxes are robust and durable, so they can withstand even the toughest conditions. Another advantage is their low weight, which makes transportation much easier.

How do I properly clean and maintain my Cool Box?

Proper care significantly extends the lifespan of your Cool Box. Basically, you should clean the box thoroughly with warm water and mild dish soap after each use. The convenient drain valve makes it easy to empty meltwater and allows for simple cleaning.

Make sure to clean all corners and edges and let the box dry completely before storing it. For a detailed guide on optimal care, we recommend our guide on cleaning & maintaining your Cool Box.

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What advantages do passive cool boxes offer?

Independence from the power grid
Passive cool boxes offer you absolute flexibility when camping in remote areas without a power connection. The ultra-passive cooling system is operated exclusively with commercially available ice or cold packs – completely without a compressor or absorber. This way you remain independent and can also choose the most remote locations for your outdoor adventures.

Robustness for outdoor use
The robust Petromax cool boxes are specially developed for demanding road trips and camping tours. Made of high-quality PE material and with an ultra-stable design, they defy all adversities in the long term. The double-walled, cavity-insulated construction ensures durability even under the toughest conditions.

Reliable cooling
Petromax cool boxes are considered particularly reliable as they maintain constant temperatures over long periods of time. The sophisticated insulation system keeps ice chilled for up to 12 days and ensures that your food and drinks always maintain the perfect temperature.

Versatile application possibilities
From day trips to multi-day camping tours, these cool boxes offer countless application possibilities. Whether at a barbecue in the park, at a festival, fishing or as a smart outdoor refrigerator on the terrace – they are your versatile companion for every adventure.

How do you choose the right cool box size?

Needs analysis
The required capacity depends on the number of people and the duration of the stay. For a weekend for two, a smaller cool box is often sufficient, while multi-day group trips require more storage space for food and drinks.

Understanding size classes
Petromax cool boxes are available in various sizes – from the compact KX25 with 25 liters to the generous KX50 with 50 liters capacity. Each size is optimally tailored to different camping scenarios: The KX25 is perfect for day trips or short trips, while the KX50 offers enough space for beverage crates as well as fresh vegetables and meat.

Optimizing space distribution
The optimal ratio between cooling space and space for cold packs is crucial for maximum efficiency. Plan about 20–30 % of the volume for cold packs or ice to achieve the best possible cooling performance. This leaves enough room for your food and drinks.

Transport aspects
The capacity directly affects weight and transportability. Additional recesses for straps or ropes allow for secure fastening during transport, so that your cool box remains safely stowed even on bumpy journeys.

How long does a cool box cool without electricity?

Understanding performance parameters
The cooling performance is influenced by several factors – the ambient temperature plays the largest role. Under optimal conditions, Petromax cool boxes can keep ice frozen for up to 12 days. The higher the outside temperature, the more the passive cooling system is stressed.

Estimating cooling duration realistically
In practice, food and drinks remain reliably chilled for 3 to 12 days – depending on the ambient temperature. On very hot days, the cooling time is shortened, while cooler weather prolongs the efficiency of the passive insulation.

Insulation techniques
The double-walled, cavity-insulated design ensures optimal passive cooling. This construction minimizes heat exchange and keeps the internal temperature constant – completely without electricity.

Temperature management
With a few simple measures, you can significantly improve the cooling performance: Open the box as rarely as possible, place it in the shade and use sufficient cold packs or ice. An integrated drain valve makes it easier to empty meltwater and contributes to a uniform temperature inside.

What makes the Petromax cool box so unique?

Housing materials
High-quality PE materials and the ultra-stable design ensure exceptional robustness and optimal insulation. The passive cool box was specially developed for extreme outdoor conditions and maintains its shape and functionality even after intensive use.

Additional equipment
The practical features make every Petromax cool box a true multi-talent:

  • Dry rack basket: Separates sensitive foods and creates an additional temperature layer.
  • Cutting and separating board: Multifunctional for cutting, separating and serving – ideal for the outdoor kitchen.
  • Seat cushion: Transforms your cool box into a comfortable seat with robust ripstop fabric.
  • Adhesive pad: Provides additional grip and protects against scratches, impacts and UV radiation.

Quality features
Petromax cool boxes impress with durability, functionality and versatility. They are not only reliable cooling systems but also practical seats. Their quiet operation without power consumption makes them the perfect companion for nature-loving adventurers who don't want to compromise on cooling.

  • BORN IN THE WILDERNESS