OUTDOOR

2025.07.09

【Ice Pack Performance】Testing the one for 3COINS soft cooler! For those who want to keep their drink cold until the end on a hot summer day

I tested how long canned drinks can stay cold outdoors in the midsummer heat. Using the ice pack for 3COINS soft cooler, I measured temperature changes over 2 hours and 15 minutes. When comparing the differences with and without the ice pack numerically, the results were as follows.

A summer park, a little luxury to enjoy the cooling power

An afternoon spent in a summer park. Just holding a cold can taken out from a cooler makes me feel as if my heart is unraveling. Even without going far, I can enjoy a nice time at the local park. This kind of way to spend my summer feels just right.

This time, I used a cooling pack for a soft cooler purchased from 3COINS to actually verify its cooling power. This cooling pack is designed to fit the shape of cans and PET bottles, allowing for efficient cooling.

While checking the temperature of the canned drinks, I will see "how long the coolness lasts" in the natural environment of the park. Let's test its effectiveness.

Outdoor temperatures exceeding 30℃, wanting to drink while it's still cold

The temperature on this day was around 30.2℃, with a humidity of 63%. It was a hot summer day with strong sunlight, making it an ideal condition to test the cooling power of the canned drinks. For the verification, I used a 350ml Mountain Dew that had been properly chilled in the refrigerator. I bundled the cooling packs with six cans using the included rubber band and set it up avoiding the drinking spout. The convenience of being able to directly take it out and drink is a unique advantage of this design.

Start: With or without cold packs, both start at 0.0℃

For the verification, we used a 350ml Mountain Dew that was thoroughly chilled in the refrigerator. We prepared two patterns, one with cold packs and one without, placing a thermometer in the center of the can to measure the temperature. The initial temperature for both was 0.0℃. The moment it touched our lips, it was at the ideal temperature that made us exclaim, "It's cold." From here, we will compare how much of a difference there is over time.

After 15 minutes: The one with cold packs rose to 2.0℃, while the one without shot up to 10.0℃

After 15 minutes, even in harsh temperatures, the can with cold packs was still at 2.0℃. The perceived temperature felt the same as immediately after taking it out of the refrigerator, and we were still able to enjoy a nice, cold sip.

On the other hand, the can without cold packs had already risen to 10.0℃ at this point. While there was still some chill when held in hand, the crisp sensation when taking a sip had faded, and satisfaction with the coldness began to decrease slightly.

After 45 minutes: The can with the ice pack reached 11.0°C, while the one without reached 20.0°C

After 45 minutes from the start of the verification, the can with the ice pack is at 11.0°C. It still retains some coldness, maintaining a drinkable temperature for carbonated beverages.

In contrast, the can without the ice pack quickly reached 20.0°C. It feels close to room temperature, and a clear warmth is felt. For a carbonated drink consumed outdoors, it was already in a state where it was difficult to feel refreshment.

After 1 hour and 15 minutes: The can with the ice pack is at 14.0°C, while the one without is at 24.0°C

Continuing the measurements, the can with the ice pack was at 14.0°C after 1 hour and 15 minutes. While it has completely lost its coldness, it is still at a level where it feels cold when held.

One can without the ice pack rose to 24.0℃ after 1 hour and 15 minutes. The lukewarmness, which seemed to exceed the outside temperature, was also conveyed through the mouthfeel, and it turned out to be in a state where it could not exhibit the appeal of a carbonated drink.

After 1 hour and 45 minutes: the one with the ice pack is still at 16.0℃

Furthermore, 30 minutes later, at the point when 1 hour and 45 minutes had passed, the can with the ice pack rose to 16.0℃. Even when picked up, there was hardly any coldness felt, and the chill sensation when tasted was almost gone. Still, it performed considerably better than the one without the ice pack.

After 2 hours and 15 minutes: even with the ice pack, it reached 19.0℃, almost room temperature.

At the verification end time of 2 hours and 15 minutes, the can with the ice pack reached 19.0℃. Even though it looked cold, the cold sensation when picked up was absent, and the chill when tasted was hardly felt. At this point, it can no longer be considered a cold drink, and it could be said to be in a state close to room temperature.

Nonetheless, compared to the cans that didn't use ice packs, the speed of temperature rise was clearly slower, and there was certainly more time available.

Conclusion: The satisfaction level is significantly different with ice packs

What I felt through this verification was that "it's just an ice pack, but it's still an ice pack." In an outdoor environment, even a few degrees difference directly affects drinkability, taste, and satisfaction. Especially in the middle of summer afternoons when temperatures exceed 30℃, whether you can enjoy a cold drink slowly can be a turning point in whether you have a comfortable time.

With just a little ingenuity, the deliciousness continues until the last sip. Knowing that difference could be seen as the composure of an adult.

If you want to enjoy outdoor time, try to be particular about keeping things cold.

Even without expensive items or extensive preparations, simply utilizing nearby tools can significantly change how we spend time outdoors. The ice pack used this time, while compact in size, provided a great fit and efficiency, creating a noticeable difference.

I snuck a cold drink and my favorite snack into the cooler and went to a nearby park. It might be in such simple moments that an adult's ease and indulgence are packed.

Product name / Ice pack for soft cooler
Price / 550 yen
Color / Green
Container / HDPE
Contents / Water, glycerin, CMC, preservatives
Rubber band / Polyester, rubber
●Pal

Interview and text / SYURI

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