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

Product ID: 50204132

Details

Brand
Cooler Shock
Color
Blue
Material
Ice Packs
Package Information
Bag
Capacity
2 Liters
Product Dimensions
1"D x 10"W x

📏10x10 inch medium size

♻️Reusable & durable nylon-reinforced

❄️Lasts 24-48 hrs cold

10577 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay Frosty, Stay Ahead: The Ultimate Ice Pack for the Modern Explorer

SPACE SAVING DESIGN - Each 10x10 inch pack replaces 3 lbs of traditional ice, freeing up cooler space for your essentials.
EXTENDED CHILL POWER - Keeps your food and drinks icy cold for up to 48 hours—no more soggy messes or melted disappointment.
GIFT THE CHILL VIBES - Ideal for the outdoorsy pros in your life—because everyone deserves to keep it cool off-grid.
EFFORTLESS PREP REUSE - Fill once with water using the included funnel, freeze, and enjoy endless reuse thanks to tough nylon reinforcement.
ADVENTURE READY COMPANION - Slim, lightweight, and perfect for camping, fishing, beach days, or any outdoor escape—your cooler’s new best friend.

Cooler Shock Reusable Ice Packs deliver long-lasting cold retention for 24 to 48 hours with a phase change temperature of 18°F. Sized at 10x10 inches, each pack replaces 3 pounds of traditional ice, maximizing cooler space. Made with durable nylon reinforcement and easy to fill with the included funnel, these reusable packs are perfect for camping, fishing, road trips, and beach outings. Trusted by thousands with a 4.6-star rating, they’re the essential gear for keeping your food and drinks fresh on every adventure.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#394 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #11 in Camping Cooler Accessories
Brand Name	Cooler Shock
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (12,113)
Date First Available	January 8, 2016
Included Components	Cork, Funnel
Item Dimensions LxWxH	10 x 1 x 10 inches
Item Package Dimensions L x W x H	11.22 x 7.44 x 2.64 inches
Item Weight	12 ounces
Manufacturer	GenTap
Material	Add Water
Number of Items	4
Package Weight	0.47 kg
Part Number	CS MID Screw Cap …
Size	All Purpose Size 4-Pack
Style	Medium - 4pk

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