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.

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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

Q: 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.

Q: 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.

Q: 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.

Product ID: 54075173

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Details

Brand
Cooler Shock
Color
Silver
Material
Ice Packs
Package Information
Box
Product Dimensions
1"D x 6.5"W x
Item Weight
0.6 Pounds

🎒Compact 5x7 inch size fits lunch boxes & coolers

🧊Nylon-reinforced durability for rugged use

❄️Keeps contents at 18°F (-8°C) for all-day chill

Description

❄️ Chill smarter, adventure longer — never settle for lukewarm again!

ALL DAY ARCTIC CHILL - Stay cool with ice packs colder than ice at 18°F, ensuring your food and drinks stay fresh from dawn till dusk.
EFFORTLESS FREEZE USE - Fill once with included funnel, freeze, and you’re set—no mess, no hassle, just pure chill.
PERFECTLY PORTABLE POWER - Slim 5x7 inch size fits seamlessly into lunch boxes, cooler totes, or backpacks for on-the-go freshness.
BUILT TOUGH FOR ADVENTURE - Nylon-reinforced design means these packs survive your wildest camping, fishing, or road trip escapades without a sweat.
THE ULTIMATE OUTDOOR ESSENTIAL - Gift the outdoorsy pro in your life the must-have reusable ice pack that keeps their off-grid meals perfectly chilled.

Cooler Shock Reusable Ice Packs deliver long-lasting cold at 18°F (-8°C) with durable nylon-reinforced construction. Sized at 5x7 inches, these portable freezer packs fit lunch boxes and coolers perfectly, making them ideal for camping, fishing, road trips, and daily use. Easy to fill with the included funnel, they offer hassle-free chilling power that keeps food and drinks fresh all day.

Specifications

Brand	Cooler Shock
Color	Silver
Material	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	Ice Packs
Product Care Instructions	Freeze when not in use
Insulation Material	Polyethylene
Chamber Depth	6.5 Inches
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