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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Description

❄️ Stay Cool, Stay Ahead: The Ice Pack That Means Business

COMPACT YET MIGHTY - Slim 5x7 inch design fits perfectly in lunch boxes, coolers, and backpacks without bulk.
ALL DAY CHILL POWER - Keeps your food & drinks icy cold at 18°F for hours—no more lukewarm disappointments.
EFFORTLESS FREEZE REUSE - Just add water once with the included funnel, freeze, and you’re set for countless adventures.
DURABILITY MEETS PORTABILITY - Nylon-reinforced for rugged use—ideal for camping, fishing, road trips, and beach days.
THE ULTIMATE OUTDOOR ESSENTIAL - Gift-ready gear for the off-grid pros who demand fresh, chilled essentials wherever they roam.

Cooler Shock Reusable Ice Packs deliver long-lasting cold at 18°F (-8°C) with a durable, nylon-reinforced design. Compact and portable at 5x7 inches, these refillable ice packs come with a funnel for easy water filling and are perfect for lunch boxes, coolers, and outdoor adventures like camping and fishing.

Specifications

Brand	Cooler Shock
Color	Silver
Material	Just Add Water Ice Packs
Package Information	Box
Product Dimensions	1"D x 6.5"W x 7.5"H
Item Weight	9.59 ounces
Special Feature	Portable
Included Components	funnel
Model Name	Just Add Water Ice Packs
Product Care Instructions	Freeze when not in use
UPC	854850006251
Size	Lunch Box Size 5-Pack
Manufacturer	Cooler Shock
Item Package Dimensions L x W x H	8.15 x 7.8 x 1.97 inches
Package Weight	0.33 Kilograms
Item Dimensions LxWxH	6.5 x 7.5 x 1 inches
Brand Name	Cooler Shock
Number of Items	5
Part Number	43237-2
Style	Lunch Box Size 5-pack

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