How long do these stay frozen for ?

Mine have stayed frozen for approximately 9-10 hrs. I left food in the cooler,which was well-insulated, and it which was still cold when I got home. This was kept in office setting with temps in room in the 70’s.

When you say that this item is colder than ice, what does that mean? ice can be cooled to any temperature unless i'm mistaken. a rock can be 18*f.

Karæthon's answer is correct. Freezing or melting overcomes the "latent heat of fusion" which is about the same heat as is required to raise the temperature of (for example) liquid water by almost 80°F, or frozen water (ice) by about 150°F. So an ice pack in a cooler will spend most of its time at it's melting point. Once it's all melted, the subsequent temperature rise will be very quick.

They are reusable. There is an initial "just add water" setup to change the dry powder to gel, then you throw them in the freezer for several hours and they are ready for use.

If I were to use two of these together, would I have similar cooling capacity as one of the medium-sized packs?

Not positive of that but I am amazed at how well these things work. 4 of them keeps a large cooler super cold.

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❄️ Stay cool, stay ahead — the ultimate chill companion!

FREEZE FORGET - Maintains a crisp -7.8°C for hours, perfect for extended cooling needs.
LIGHTWEIGHT POWER - At just 200g per pack, it’s easy to carry yet packs a serious cooling punch.
SPACE SMART DESIGN - Ultra-thin 0.2mm profile fits seamlessly in any cooler or bag without bulk.
ECO CHIC REUSABILITY - Use again and again—durable materials ensure longevity and sustainability.
PRECISION COOLING TECH - Inspired by blood transport tech, guarantees stable temperature without chemical risks.

The クーラーショック保冷剤 3個セット Lサイズ is a high-performance ice pack set designed with advanced blood transport cooling technology. Each pack maintains a steady -7.8°C for hours, freezes within 12 hours, and features a slim, lightweight design (0.2mm thickness, 200g) for easy portability. Made from safe, eco-friendly materials and reusable, it’s perfect for professionals who demand reliable, long-lasting cooling without bulk.

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Color	set of 3
Size	L size
Manufacturer	クーラーショック(COOLER SHOCK)
Included Components	No
Material	Silica Sodium Chloride
Item Weight	0.2 Kilograms
Product Dimensions	25.4 x 35.56 x 3.81 cm; 200 g
Package Weight	0.62 Kilograms
Batteries Required	No
Batteries Included	No
Brand Region of Origin	アメリカ
Country/Region	China

Cooler Shock Ice Packs, Set of 3, Large Size, Can Be Used Repeatedly, Keeps -7.8 °C (7.8 °C)

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