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 Ice Pack That Outlasts Your Weekend Plans

EFFORTLESS PREP - Fill once with water, freeze, and reuse endlessly—eco-friendly convenience at its best.
FREEZE FORGET - Keeps your food and drinks chilled up to 48 hours—no more soggy ice messes!
GIFT THE CHILL VIBES - Perfect for the outdoorsy pro in your life—essential gear for every off-grid escape.
BUILT TOUGH FOR ADVENTURE - Nylon-reinforced packs replace 5-6 lbs of ice, maximizing cooler space for essentials.
YOUR ULTIMATE OUTDOOR SIDEKICK - Slim design fits perfectly in large coolers, ideal for camping, fishing, and beach days.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of superior cold retention with a durable nylon-reinforced design. Sized at 10"x14"x1.5", each pack replaces 5-6 lbs of traditional ice, freeing up cooler space for your essentials. Easy to fill and endlessly reusable, these portable ice packs are perfect for camping, fishing, hiking, and beach trips—making them a must-have for any outdoor enthusiast.

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Brand	Cooler Shock
Color	Gray
Material	Just Add Water Ice Packs
Package Information	Bag
Capacity	8 Mils
Product Dimensions	10"D x 14"W x 1.5"H
Item Weight	0.2 Kilograms
Special Feature	Portable
Recommended Uses For Product	Camping, Fishing, Hiking
Pattern	Letter Print
UPC	854850006121
Manufacturer	GenTap
Item Package Dimensions L x W x H	10.47 x 8.5 x 1.89 inches
Package Weight	0.62 Kilograms
Item Dimensions LxWxH	10 x 14 x 1.5 inches
Brand Name	Cooler Shock
Part Number	7CSLSET
Style	Cooler Size 3-pack

Cooler Shock Reusable Ice Packs for Cooler - Long Lasting Cold Freezer Packs for Coolers and Lunch Boxes - Cooler Ice Packs for Camping Gear, Fishing, Road Trips, Beach Must Haves

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