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

8787 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

ECO FRIENDLY CHILL - Just add water once, then reuse endlessly—no more buying or melting bulky ice.
MAXIMIZE COOLER SPACE - Replaces 5–6 lbs of ice per pack, freeing up room for more food and drinks.
ADVENTURE READY 4 PACK - Consistent cold coverage across multiple compartments for camping, fishing, or road trips.
TAILORED FOR YOUR COOLER - Perfectly sized for most coolers and beach totes—measure once, chill forever.
FREEZE FORGET FOR 48 HOURS - Keeps your cooler contents icy cold longer than standard ice with an 18°F phase change point.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of reliable cold at 18°F, using a patented phase change technology. Designed to replace bulky ice, each 10x10 inch pack frees up valuable cooler space while being eco-friendly and reusable with just water. Ideal for outdoor enthusiasts, these durable packs come in a convenient 4-pack, perfect for camping, fishing, beach days, and road trips.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#497 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #9 in Camping Cooler Accessories
Brand Name	Cooler Shock
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (12,126)
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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