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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4 Mid-Size Cooler Freeze Packs 10" x 10” The Coldest Pack at 18 Degrees F. No More Ice! Reusable. You Add Water & Save! - C.S. Brand Packs Have Over 4,000 Reviews Averaging 4.6 Stars - Safe USA Made

Product ID: 64016850

Details

Brand
Cooler Shock
Capacity
2 litres
Colour
Blue
Included components
5 reusable ice
Item weight
0.75 Pounds
Material
Nylon

💪Nylon reinforced for ultimate durability

♻️Reusable & eco-friendly water-activated

❄️Coldest at 18°F for up to 48 hrs

13261 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Chill smarter, last longer — the ultimate freeze pack for the modern explorer!

ECO SMART COOLING - Simply add water and reuse endlessly—save money and reduce waste with every freeze.
FREEZE BEYOND ICE - Stay chill with packs colder than ice at 18°F, keeping your food and drinks fresh for up to 48 hours.
TRUSTED BY THOUSANDS - Over 4,000 rave reviews averaging 4.6 stars prove these are the go-to cooler packs for pros and adventurers alike.
PAIN RELIEF ON DEMAND - Dual-purpose cold therapy for soothing injuries or post-surgery recovery, wrapped for safe skin contact.
BUILT TO BRAVE ANY TRIP - Nylon-reinforced design ensures these packs survive freezer to cooler journeys without fail.

The Cooler Shock 4 Mid-Size Freeze Packs deliver industry-leading cold retention at 18°F, lasting up to 48 hours. Made in the USA with durable nylon reinforcement, these reusable packs are perfect for keeping food and drinks icy cold on extended trips or providing effective cold therapy. With over 4,000 high-rated reviews, they combine eco-friendly convenience with professional-grade performance.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	136,885 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 243 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	2 litres
Chamber Depth	10 Inches
Chamber Height	9 Inches
Colour	Blue
Container Type	Bag
Customer Reviews	4.6 4.6 out of 5 stars (11,581)
Included Components	5 reusable ice packs
Insulation Material Type	Polyethylene
Item Dimensions D x W x H	2.5D x 25.4W x 25.4H centimetres
Item Weight	0.75 Pounds
Manufacturer	GenTap
Manufacturer Part Number	CS MID Screw Cap …
Material Type	Nylon
Model Number	Shock-1/18F-Dry
Pattern	Solid
Product Care Instructions	Check manufacturer guidelines
Recommended Uses For Product	Camping, Fishing, Road Trips, Beach Outings, Parties, Tailgating, Boating
Size	Mid-size
Special Features	Portable
UPC	854850006206

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13261 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered 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 Iceland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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