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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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

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

📏10x10 inch medium size

♻️Reusable & refillable

❄️24-48h lasting cold

S$71

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Description

❄️ Stay Cool, Stay Ahead — The Ultimate Ice Pack Upgrade

EFFORTLESS REUSE - Fill once, freeze, and reuse endlessly with included funnel and durable nylon-reinforced casing.
THE GIFT OF CHILL - Ideal for outdoorsy friends who demand reliable, eco-friendly cooling on every getaway.
SPACE SAVING DESIGN - Each 10x10 inch pack replaces 3lbs of traditional ice, freeing up cooler space for essentials.
UNMATCHED COLD RETENTION - Keeps your food and drinks chilled for up to 48 hours—no more soggy ice mess!
ADVENTURE READY COMPANION - Slim, lightweight, and perfect for camping, fishing, beach days, or road trips—stay cool anywhere.

Cooler Shock Reusable Ice Packs deliver industry-leading cold retention for 24 to 48 hours with a phase change point of 18°F. Sized at 10x10 inches, each pack replaces 3lbs of traditional ice, maximizing cooler space. Designed for durability and ease, these nylon-reinforced packs come with a funnel and caps for simple filling and endless reuse. Perfect for camping, road trips, and beach outings, they combine eco-conscious convenience with high-performance cooling, making them a must-have for any outdoor enthusiast.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#424 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6 in Camping Cooler Accessories
Brand Name	Cooler Shock
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (29,021)
Date First Available	January 8, 2016
Included Components	Cork, Funnel
Item Dimensions LxWxH	10 x 9 x 1 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 Kilograms
Part Number	CS MID Screw Cap …
Size	All Purpose Size 4-Pack
Style	Medium - 4pk

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S$71

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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