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
1660 ml
Color
Gray
Item Weight
1 pounds
Material
Add Water
Package Information
Bag

📏Space-saving 14x10 inch size

♻️Reusable with water refill

❄️48-hour cold retention

€ 137.04

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Chill smarter, not harder — the ultimate ice pack upgrade for pros on the go!

MAXIMIZE COOLER SPACE - Replaces 5–6 lbs of ice per pack, freeing up room for more food and drinks without sacrificing cold power.
ADVENTURE READY 3 PACK - Multiple packs cover all your compartments, ideal for camping, fishing, road trips, and beach days.
TAILORED FOR YOUR GEAR - Perfectly sized for coolers and beach totes, ensuring a snug fit and optimal cooling performance.
STAY CHILL TWICE AS LONG - Keeps your cooler contents icy cold for up to 48 hours with an 18°F phase change technology.
ECO FRIENDLY EFFORTLESS - Just add water once, freeze, and reuse endlessly—no more buying or melting bulky ice.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of consistent cold with innovative 18°F phase change technology. Designed to replace bulky ice, each 14"x10" pack frees cooler space while being eco-friendly and reusable with a simple water refill. Perfectly sized for coolers and totes, this durable 3-pack set is your must-have companion for camping, fishing, road trips, and beach adventures.

Specifications

ASIN	B06XH9GB75
Additional Features	Portable
Best Sellers Rank	#845 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	1660 ml
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 (8,537)
Insulation Material Type	Polyethylene
Item Dimensions D x W x H	1"D x 14"W x 10"H
Item Weight	1 pounds
Manufacturer	GenTap
Manufacturer Part Number	7CSLSET
Material Type	Add Water
Model Number	7CSLSET
Number of Items	3
Number of Packs	3
Pattern	Letter Print
Recommended Uses For Product	Camping, Fishing, Hiking
Size	14"x10"x1.5"
UPC	854850006121

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