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

📏Perfect 10x10 inch cooler fit

♻️Reusable with water refill

❄️48-hour cold retention

€ 73.17

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Description

❄️ Stay Chill, Stay Ahead: The Ice Pack That Outlasts Your Weekend Plans

ADVENTURE READY 4 PACK - Consistent cold coverage across multiple compartments—perfect for camping, fishing, and road trips.
ECO FRIENDLY REUSABLE DESIGN - Just add water once, freeze, and reuse endlessly—save money and reduce waste.
FREEZE TO 18 F FOR 48 HOURS - Keeps your cooler contents colder, longer—no more soggy ice messes.
SPACE SAVING ICE REPLACEMENT - Replaces 5–6 lbs of bulky ice per pack, freeing up cooler space for more essentials.
TAILORED FOR COOLERS TOTES - Precisely sized to fit most insulated coolers and beach totes for maximum efficiency.

Cooler Shock Reusable Ice Packs deliver up to 48 hours of consistent cold at 18°F, replacing bulky ice with a compact, refillable design. Sized at 10x10 inches, these nylon-reinforced packs fit perfectly in coolers and totes, making them ideal for camping, fishing, and road trips. Each 4-pack includes a funnel for easy water filling, offering an eco-friendly, space-saving solution trusted by thousands of outdoor enthusiasts.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#395 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 (12,115)
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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€ 73.17

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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