Summer Special 2025

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.

The Petromax cooling products are designed to keep your food and drinks cool for a long period of time without electricity. The Petromax cool boxes can keep your supplies fresh for up to 12 days by using an ultra-passive cooling system powered by ice or ice packs. The cooler bags offer up to 6 days of cooling, while the cooler backpacks can keep your food and drinks cool for up to 8 days. These periods can vary depending on the outside temperature and usage, but they offer you the security of always having fresh food available, even on long trips.

Of course! Our cooler bags are robust and water-repellent. So you can take them to the beach without worrying. And if they get wet, you can simply leave them to dry.

The question of whether you need a passive or active cooler depends entirely on your taste!

Passive coolers offer freedom and independence. They work without an external power source and are therefore ideal for anyone who values flexibility. Whether you're camping in remote regions, on a boat or simply having a picnic in the park - a passive cool box is always ready for use.

The way it works is very simple: high-quality insulation and pre-cooled elements such as ice packs or ice create a stable temperature inside. This makes passive cool boxes robust companions for outdoor adventures. They are easy to use, require no maintenance and are often lighter than their active counterparts.

The advantages of passive cool boxes at a glance:

Independence: no dependence on power sources.
Robustness: Resistant to shocks and external influences.
Environmentally friendly: No power consumption.
Cost-effective: Often cheaper to buy than active models.
Simplicity: No complicated technology.

Of course, passive coolers also have their limits. The cooling capacity is limited and depends on factors such as the outside temperature, the quality of the insulation and the quantity of cool packs.

Active coolers are more the power types without much flexibility. They provide constant cooling over a long period of time, provided you have access to a power source. They are perfect if you are planning a camping trip lasting several weeks or simply want to have ice-cold drinks with you over a long period of time. But they also need power, and that can be inconvenient.

In the end, you have to decide for yourself what is more important to you: flexibility and simplicity or maximum cooling capacity. Both coolers have their appeal. Just give it a try!

The Petromax cooler bags and cooler backpacks are made of water-repellent material and have waterproof zippers. This ensures that your contents are optimally protected, even if you are traveling in damp or wet environments. The cool boxes are also robust and offer a high level of protection against moisture. These features make our cooling products reliable companions in all weather conditions and outdoor activities.

To optimize the cooling performance of your bag, follow these tips:

Preparation: Cool the bag and the food as much as possible before filling it.
Ice: Use sufficient ice or cool packs.
Arrangement: Pack the food so that it cools each other.
Opening: Reduce the opening of the bag to a minimum.
Shade: Place the bag in a shady spot.
Insulation: Use additional insulating materials such as foam or polystyrene.