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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Soft Packs - Medium

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

¥12140

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Description

❄️ Chill smarter, not harder — the last ice pack you'll ever need!

MAXIMIZE COOLER SPACE - Replaces bulky ice with slim 10x10 packs, freeing up room for more snacks and drinks.
READY FOR EVERY ESCAPE - Ideal for camping, fishing, road trips, and beach days—your ultimate cold companion.
STAY CHILL TWICE AS LONG - Keeps your cooler contents icy cold for up to 48 hours, outperforming regular ice.
ECO FRIENDLY EFFORTLESS - Just add water once, freeze, and reuse endlessly—no more messy ice refills.
TAILORED FOR YOUR ADVENTURES - Designed to fit most coolers and totes perfectly, ensuring cold coverage wherever you go.

Cooler Shock Reusable Ice Packs deliver a game-changing 48-hour cold retention at 18°F, using a patented phase change technology. Each 10x10 inch pack replaces 5-6 lbs of bulky ice, saving cooler space while maintaining safe temperatures. Made with durable nylon-reinforced materials, these eco-friendly packs refill with water and freeze repeatedly, perfect for camping, fishing, road trips, and beach outings.

Specifications

ASIN	B0773FVRZY
Best Sellers Rank	#461 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #9 in Camping Cooler Accessories
Brand Name	Cooler Shock
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (12,118)
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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¥12140

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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