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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Ice Packs for Coolers, Cooler Freezer Packs, The Coldest Pack at 18 Degrees F. No Ice Needed, Reusable

Ice Packs for Coolers, Cooler Freezer Packs, The Coldest Pack at 18 Degrees F. No Ice Needed, Reusable

Product ID: 257220189

Details

Brand
Cooler Shock
Capacity
0.5 Kilograms
Colour
Solid Black
Material
Polyethylene
Package information
Bag

♻️Reusable & eco-friendly

❄️Keeps cool at 18°F

🇺🇸Made in USA, safe formula

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68886CFA

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Description

❄️ Stay chill, stay ahead—cooler than the rest!

ECO SMART REUSABLE - Hydrate, freeze, and reuse again and again—cut waste, save money.
UNMATCHED CHILL POWER - Stays icy cold at 18°F for up to 10 hours—no ice needed, no mess.
TRUSTED BY OUTDOOR PROS - Top-rated for camping and daily use—keeps food fresh and bacteria-free.
KID SAFE CHEMICAL FREE - USA-sourced, non-toxic ingredients with zero mystery chemicals.
PERFECT FIT FOR EVERY LUNCH - Large size fits all standard lunch boxes and coolers effortlessly.

Cooler Shock Ice Packs deliver industry-leading cooling at a consistent 18°F using advanced phase change technology. Made in the USA with safe, non-toxic ingredients, these reusable packs fit all standard lunch boxes and coolers, keeping contents fresh and cold for up to 10 hours. Perfect for professionals, parents, and outdoor enthusiasts seeking reliable, eco-friendly cooling without the hassle of melting ice.

Specifications

ASIN	B078FR9CND
Additional Features	Portable
Best Sellers Rank	#24,946 in Sporting Goods ( See Top 100 in Sporting Goods ) #111 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	0.5 Kilograms
Chamber Depth	18 Centimeters
Color	Solid Black
Container Type	Bag
Customer Reviews	4.6 4.6 out of 5 stars (8,492)
Included Components	funnel
Insulation Material Type	Polyester
Item Dimensions D x W x H	2.5D x 16.5W x 19.1H centimeters
Item Weight	272 g
Manufacturer	Cooler Shock
Manufacturer Part Number	43237-2
Material Type	Polyethylene (PE)
Model Name	Ice Packs
Pattern	Solid
Product Care Instructions	Handle gently, clean up spills promptly, store in a cool, dry place, and ensure it is fully dry before storing.
Recommended Uses For Product	Camping, Fishing, Picnic, Road Trips
Size	Lunch Bag Size
UPC	854850006251
Unit Count	5 Count

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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