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: 50204132

Details

Brand
Cooler Shock
Color
Blue
Material
Ice Packs
Package Information
Bag
Capacity
2 Liters
Product Dimensions
1"D x 10"W x

📏Compact 10x10 inch size

♻️Reusable with water refill

❄️48-hour cold retention

COP 232371

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay Chill, Stay Ahead – The Cooler Shock Revolution

MAXIMIZE COOLER SPACE - Replaces bulky 5-6 lbs of ice per pack, freeing up room for more food and drinks.
ADVENTURE READY 4 PACK - Multiple packs ensure consistent cold coverage across compartments for camping, fishing, or road trips.
ECO FRIENDLY REUSABILITY - Just add water once, freeze, and reuse endlessly—no more buying or melting ice.
TAILORED FOR YOUR COOLER - Precisely sized 10x10 inches to fit most coolers and beach totes for seamless chilling.
FREEZE FORGET FOR 48 HOURS - Keeps your cooler contents icy cold longer than standard ice, perfect for extended trips.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of consistent cold at 18°F, using a patented phase change formula. Designed to replace bulky ice, these 10x10 inch packs save cooler space and are refillable with water for endless reuse. Perfectly sized for coolers and totes, they come in a convenient 4-pack ideal for camping, fishing, beach days, and road trips.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#545 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #10 in Camping Cooler Accessories
Brand Name	Cooler Shock
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (12,125)
Date First Available	January 8, 2016
Included Components	Cork, Funnel
Item Dimensions LxWxH	10 x 1 x 10 inches
Item Package Dimensions L x W x H	11.22 x 7.44 x 2.64 inches
Item Weight	12 ounces
Manufacturer	GenTap
Material	Add Water
Number of Items	4
Package Weight	0.47 kg
Part Number	CS MID Screw Cap …
Size	All Purpose Size 4-Pack
Style	Medium - 4pk

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COP 232371

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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