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.

Cooler Shock Large Ice Packs, Set of 3, Reusable and Maintains -7.8℃

Product ID: 734185685

Details

Brand
Shock)
Color
set of 3
Material
Silica Sodium
Package Information
Box
Capacity
8 Mils
Item Weight
0.2 Kilograms

📏Large 10x10 inch size

🧊Reusable & eco-friendly

❄️Keeps -7.8°C for hours

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay cool, stay ahead—because your cooler deserves the best chill!

HASSLE FREE REUSE - Simply refill with water and freeze again—no mess, no waste.
ARCTIC CHILL POWER - Maintains a precise -7.8°C to keep your perishables fresher, longer.
TRIPLE PACK EFFICIENCY - Set of 3 large ice packs ensures maximum cooling coverage for any cooler size.
SPACE SMART LIGHTWEIGHT - Slim 1-inch profile saves cooler space without adding bulk or weight.
MEDICAL GRADE COOLING TECH - Developed from blood transport tech for unmatched temperature stability.

Cooler Shock Ice Packs are a set of three large, reusable ice packs engineered with advanced medical-grade cooling technology to maintain a steady -7.8°C. Designed with triple-layer aluminum and durable materials, they offer superior thermal conductivity and space efficiency, making them perfect for outdoor activities, travel, and everyday use. Easy to refill and freeze, these ice packs reduce cleanup and keep your cooler colder, longer.

Specifications

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

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