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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Chill Out in Style! ❄️

VERSATILE RELIEF - Ideal for knee injuries, back pain, and post-surgery recovery.
GENEROUS CAPACITY - Each pack holds up to 2 liters of cold goodness.
STAY COOL ANYWHERE - Perfect for picnics, outdoor adventures, and more!
COMPACT LIGHTWEIGHT - Easily fits in any cooler or lunch bag without the bulk.
REUSABLE ECO FRIENDLY - Reduce waste with these long-lasting ice packs.

Cooler Shock Reusable Ice Packs are a set of 4 long-lasting, portable freezer packs designed to keep your food and drinks cold during outdoor activities. Each pack measures 10x9 inches and holds 2 liters of cold, making them perfect for picnics, fishing trips, or even providing relief for injuries. Lightweight and easy to use, these ice packs are a must-have for any adventure.

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Brand	Cooler Shock
Package Information	Box
Capacity	2 litres
Item Dimensions LxWxH	25.4 x 2.5 x 25.4 Centimeters
Item Weight	0.75 Pounds
Special Feature	Portable
Recommended Uses For Product	Picnic, Outdoor, Fishing, Hiking
Pattern	stars
Chamber Height	9 Inches
League	ncaa
Item model number	Shock-1/18F-Dry
ASIN	B0773FVRZY

Cooler Shock Reusable Ice Packs (Set ofÃ‚ 4) - Long Lasting Cold Freezer Packs for Large Coolers & Lunch Bags - Compress for Knee Injuries, Back Pain Relief, Post-Surgery Accessories

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