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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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

Product ID: 41205888

Details

Brand
Cooler Shock
Capacity
8 Mils
Color
Gray
Item Weight
0.2 Kilograms
Material
Add Water
Package Information
Bag

💪Nylon-reinforced durability

🧊Replaces 5-6 lbs ice

❄️48H lasting cold

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Description

❄️ Chill smarter, not harder—cooler gear for the modern explorer!

MAXIMIZE COOLER SPACE - Slim 10"x14" profile replaces bulky ice with efficient cooling, freeing up room for your essentials.
STAY CHILL STAY AHEAD - Keeps your food & drinks cold up to 48 hours—no more soggy mess or melted ice panic.
ONE TIME PREP ENDLESS REUSE - Fill once with water, freeze, and reuse again and again—eco-friendly and hassle-free cold storage.
THE ULTIMATE OUTDOOR SIDEKICK - Perfect for millennial pros balancing work, travel, and play—never compromise on freshness or style.
BUILT TOUGH FOR EVERY ADVENTURE - Nylon-reinforced design means these packs survive rugged camping, fishing, and beach trips without fail.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of superior cooling with a phase change point of 18°F. Their nylon-reinforced, slim design replaces 5-6 lbs of traditional ice, maximizing cooler space while ensuring durability. Easy to fill and endlessly reusable, these packs are essential for camping, fishing, road trips, and everyday lunch boxes—trusted by thousands for reliable, long-lasting cold.

Specifications

ASIN	B06XH9GB75
Additional Features	Portable
Best Sellers Rank	#446 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	8 Mils
Chamber Depth	10 Inches
Chamber Height	10 Inches
Chamber Width	10 Inches
Color	Gray
Container Type	Bag
Customer Reviews	4.6 4.6 out of 5 stars (29,032)
Insulation Material Type	Polyethylene
Item Dimensions D x W x H	10"D x 14"W x 1.5"H
Item Weight	0.2 Kilograms
Manufacturer	GenTap
Manufacturer Part Number	7CSLSET
Material Type	Add Water
Model Number	7CSLSET
Pattern	Letter Print
Recommended Uses For Product	Camping, Fishing, Hiking
Size	14"x10"x1.5"
UPC	854850006121

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