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.

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	0.6 Pounds
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

Small Cooler Shock Ice Packs

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