Owning an ICEY TEK is a commitment to quality, but how you pack that box determines whether you're eating fresh steak or lukewarm leftovers by day four. Long-time user and researcher Ian H. has spent years field-testing the limits of thermal performance.
"I don't profess to be an expert," Ian says, "just a very satisfied user." Through his research, he developed the IAN System — a methodical approach to keeping food at safe temperatures for up to 6 days.
1. The pre-chill: don't fight a losing battle
Ian's research confirms a hard truth: if your cooler is warm, your ice is already dying. "A quality box will be substantial in its construction and if stored in the sun or a hot garage it will become warm and retain heat."
Use a bag of ice or frozen juice bottles for at least 12 hours before packing.
The goal: Ian stresses that you must "remove as much heat as possible from the box before using it," otherwise the heat of the insulation will "make the bricks thaw earlier and reduce their effectiveness."
Contact cooling: "Make sure they touch the sides as much as possible not just sitting in air," Ian advises. "This allows for better heat transfer from the box sides."
2. The science of the 37% ratio
While the Rule of Thirds is a reliable starting point, Ian's testing provides a more precise blueprint. He warns against misleading "ice challenges" found online, noting that "I am not sure how meaningful it is to have a cup full of ice and half a cooler of water after x days."
"In my experience somewhere between 30 and 40% gel bricks in a 40 to 50L cooler will give satisfactory cooling for 4 to 6 days... I currently use 2 size 4 and 3 size 2 bricks... 17L in a 46L box or 37% of the box taken up by frozen material that fits exactly from edge to edge of the cooler." — Ian H.
For a simplified version of this formula that scales to any cooler size, see The Math of Cold: Predicting Ice Life.
3. Thermal layering: the reverse fridge
In a standard home refrigerator, the freezer is on top. Ian's research proves that in a cooler, you must reverse this logic because "there is no fan to circulate cold air."
The engine room: "I consider the bricks being flat on the bottom to be an essential starting point for the food cooling process," Ian notes.
The logic: By stacking bricks at the bottom and vertically around the edges, Ian aims to "maximise the frozen surfaces available for food containers to touch to help them stay cool."
The layering: Food should be loaded in the part of the box that suits its needs: "very cold at the bottom and much less cold near the lid."
4. Hardware choices: metal over plastic
One of the most practical parts of Ian's research is his shift toward stainless steel Gastronorm containers.
The conductor: "Stainless conducts the cold very well and is easy to clean," Ian explains.
Direct interface: "The basis for doing this style of packing is because it is the best way to transmit cold — via a direct interface, not just sitting in an air pocket."
Air management: Ian warns that "too much air actually limits the ability to keep contents cool." He suggests putting empty containers back into the box or replacing them with chilled items to "keep the general air to a minimum."
5. Final prep: the night before
The IAN System doesn't start at the boat ramp — it starts in your kitchen. Ian recommends packing all your containers the night before and putting them in the fridge.
"When you transfer them to your cooler box the next day the container, the food and the air in them will be chilled and ready to go and not an immediate drain on the bricks in your box." — Ian H.
For more on safe pre-packing of meat and dairy before a multi-day trip, see Packing Meat and Dairy Safely in a Cooler.
The IAN system hardware kit
To replicate Ian's results in a 40L to 50L setup, these are the specific tools used in his testing:
The box: Pro Series 50L Hard Cooler. Ian chose this because "its measurements allow for a perfect fit for the ICEY TEK bricks plus it is a quality, durable box that is working very well."
The power: 2 x ICEY TEK Large Gel Bricks (Size 4) and 3 x ICEY TEK Medium Gel Bricks (Size 2).
The conductors: Stainless steel Gastronorm pans (1/4 size, 100mm deep).
"The very bottom brick is usually still largely frozen after 4 or 5 days when we unpack after a trip," Ian concludes. Proof that with the right box and the right system, you don't need expensive technology to stay chilled off-grid.