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

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: 257032670

Details

Brand
Cooler Shock
Capacity
8 Mils
Colour
Gray
Material
Polyethylene
Package information
Bag

⏳up to 48 hrs chill time

❄️18°F ultra-cold tech

🛡️50% stronger nylon-reinforced

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€ 67.64

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay Frosty, Stay Ahead: The Ice Pack That Outlasts Your Weekend Plans

EFFORTLESS CHILL PREP - One-time water fill with included funnel, shake, seal & freeze—ready to cool your adventures in minutes.
FREEZE FRAME FRESHNESS - Keeps your food & drinks icy cold at a frosty 18°F (-8°C) for up to 48 hours—because lukewarm is not an option.
BUILT TO BRAVE THE OUTDOORS - Nylon-reinforced durability means these packs survive rugged camping, fishing, and road trips without breaking a sweat.
PERFECT FIT FOR EVERY COOLER - Generous 10x10 inch size designed to maximize cooling space in coolers, lunch boxes, and beach bags alike.
THE ULTIMATE GIFT FOR TRAILBLAZERS - Give the gift of lasting cold—ideal for anyone who thrives off-grid and refuses to compromise on freshness.

Cooler Shock Reusable Ice Packs deliver industry-leading cold retention at 18°F (-8°C), keeping perishables chilled for up to 48 hours. Engineered with a nylon-reinforced shell for 50% greater durability, these large 10x10 inch packs are easy to fill once and freeze, making them perfect for camping, fishing, and travel. Trusted by thousands, they combine advanced phase-change technology with rugged portability to keep your cool wherever life takes you.

Specifications

ASIN	B06XH9GB75
Additional Features	Portable
Best Sellers Rank	#56,755 in Sporting Goods ( See Top 100 in Sporting Goods ) #192 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	8 Mils
Chamber Depth	2.5 Centimeters
Chamber Height	10 Inches
Chamber Width	10 Inches
Color	Gray
Container Type	Bag
Customer Reviews	4.6 4.6 out of 5 stars (7,678)
Insulation Material Type	Polyethylene
Item Dimensions D x W x H	25.4D x 35.6W x 3.8H centimeters
Item Weight	0.2 Kilograms
Manufacturer	GenTap
Manufacturer Part Number	7CSLSET
Material Type	Polyethylene (PE)
Model Number	7CSLSET
Pattern	Solid
Recommended Uses For Product	Camping, Fishing, Hiking
Size	Cooler Size 3-Pack
UPC	854850006121
Unit Count	3 Count

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