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

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: 54075173

Details

Brand
Cooler Shock
Capacity
0.5 kg
Color
Silver
Included Components
funnel
Item Weight
9.6 ounces
Material
Add Water

🎒Compact 6.5x7.5 inch size

🧊Reusable & leak-proof design

❄️Coldest at 18°F (-8°C)

R$542

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

EFFORTLESS SETUP - Includes funnel & stopper for a quick fill, freeze, and go—perfect for busy professionals on the move.
ALL DAY CHILL POWER - Keeps your food & drinks icy cold at 18°F for hours—no more soggy mess or melted ice panic.
DURABLE TRAVEL READY - Nylon-reinforced, lunchbox-sized packs built to withstand rugged outdoor adventures and daily commutes.
ECO FRIENDLY COST SAVING - Reusable design eliminates single-use ice bags, saving money and reducing waste while keeping you cool.
VERSATILE COOLING SOLUTION - Ideal for coolers, lunch bags, backpacks, and beach totes—your go-to for work, school, or weekend escapes.

Cooler Shock Reusable Ice Packs deliver long-lasting cold at 18°F (-8°C) with a durable, nylon-reinforced design sized perfectly for lunch boxes and coolers. Easy to fill with included funnel and stopper, these compact packs keep food and drinks chilled for hours during work, school, or outdoor adventures. Trusted by thousands with a 4.6-star rating, they offer a mess-free, eco-friendly alternative to traditional ice blocks—making them an essential accessory for any active lifestyle.

Specifications

ASIN	B078FR9CND
Additional Features	Portable
Best Sellers Rank	#216 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #8 in Camping Cooler Accessories
Brand Name	Cooler Shock
Capacity	0.5 kg
Chamber Depth	6.5 inches
Color	Silver
Container Type	Box
Customer Reviews	4.6 4.6 out of 5 stars (9,171)
Included Components	funnel
Insulation Material Type	Polyethylene
Item Dimensions D x W x H	1"D x 6.5"W x 7.5"H
Item Weight	9.6 ounces
Manufacturer	Cooler Shock
Manufacturer Part Number	43237-2
Material Type	Add Water
Model Name	Just Add Water Ice Packs
Model Number	CS-FRZPK-S5
Product Care Instructions	Freeze when not in use
Recommended Uses For Product	Camping Gear, Fishing, Road Trip, Beach, Lunch Boxes, Backpack Cooler, Work, School, Outdoor Adventures
Size	Lunch Box Size 5-Pack
UPC	854850006251
Unit Count	5 Count

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