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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Description

❄️ Chill smarter, adventure longer!

SLIM FIT MAXIMUM SPACE - At just 1.5 inches thick, these ice packs slide easily into any cooler or lunch box without sacrificing storage.
STAY CHILL TWICE AS LONG - Keeps your food and drinks cold up to 48 hours with advanced phase change technology at 18°F.
ONE TIME PREP ENDLESS REUSE - Fill once with water using the included funnel, freeze, and enjoy repeated use—eco-friendly and hassle-free.
YOUR ULTIMATE OUTDOOR SIDEKICK - Perfect for camping, fishing, road trips, and beach days—never compromise on freshness or convenience.
BUILT TOUGH FOR EVERY ADVENTURE - Nylon-reinforced exterior withstands rugged use, replacing 5-6 lbs of traditional ice to maximize cooler space.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of sustained cold with a durable nylon-reinforced design that replaces bulky ice. Slim and portable, these 10x14 inch packs maximize cooler space and are perfect for outdoor enthusiasts seeking reliable, eco-friendly cooling on the go.

Specifications

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
Included Components	無し
Recommended Uses For Product	Camping, Fishing, Hiking
Model Name	繰り返し使用可 -7.8℃をキープ
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

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