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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❄️ Stay Cool, Stay Ahead: The Ultimate Chill Companion for the Modern Pro

BACTERIA BLOCKER - Keeps food fresh and safe by preventing bacterial growth and spoilage when used as directed.
ECO CHIC REUSABLE - Sustainably designed to be reused again and again, cutting waste without sacrificing chill.
FREEZE DEFYING COOL - Harnesses phase change science to maintain a frosty 18°F well past lunchtime, no ice needed.
KID SAFE CHEMICAL FREE - Crafted with non-toxic, USA-sourced ingredients—no mystery chemicals, just pure peace of mind.
PERFECT FIT FOR YOUR LUNCH - Large, versatile size fits all typical lunch boxes, making it the ultimate daily companion.

These Cooler Shock ice packs leverage advanced phase change technology to maintain an ultra-cold 18°F temperature for up to 10 hours. Made in the USA with non-toxic, child-safe ingredients, they fit all standard lunch boxes and are reusable, eco-friendly, and designed to keep your food fresh and bacteria-free without the mess of traditional ice.

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哈立德 Z.

从订购到送货的体验都很棒。强烈推荐！

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Age Range	Kid
Color	Silver
Size	Lunch Box Size 5-Pack
Style	Lunch Box Size 5-pack
insulation-material-type	Polyethylene
Length	19 centimeters
Weight	283 g
Width	16.5 centimeters
Material Type	Ice Packs
Number of Items	5
Number of Pieces	5
Features	Portable
Included Components	funnel
Batteries Included?	No
Brand	Cooler Shock
Manufacturer	Cooler Shock
Manufacturer reference	43237-2
Product Dimensions	16.51 x 19.05 x 2.54 cm; 272 g
ASIN	B078FR9CND

Ice Packs for Coolers, Cooler Freezer Packs, The Coldest Pack at 18 Degrees F. No Ice Needed, Reusable

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