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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Description

❄️ Freeze the moment, not your plans!

PERFECTLY PORTABLE - Compact 10x10 inch design fits seamlessly in any mid-size cooler.
ULTIMATE CHILL POWER - Stay cool longer with the coldest pack at 18°F—no ice needed!
ECO FRIENDLY REUSABILITY - Simply add water and reuse endlessly, saving money and waste.
DURABLE POLYETHYLENE BUILD - Crafted from tough PE material for reliable, leak-proof performance.
LIGHTWEIGHT TRAVEL READY - Weighing just 340g, it’s your ideal companion for on-the-go freshness.

This 4-pack of mid-size 10x10 inch cooler freeze packs delivers the coldest temperature at 18°F without ice. Made from durable polyethylene, they are reusable by simply adding water, lightweight at 340g each, and perfectly sized for portable cooling solutions.

Reviews

チ**カ

大きい

水を適量計って入れる作業が要るが特に困る事は無い。ただ大きさをわかっていたつもりが想像より大きく分厚さもあるため手持ちのクーラーボックスではそのままでは使えずに凍らす時に折り曲げている。Mを４つ買ったがMは一つでSを複数の方が良かったかもしれない。まだ２つしか使っていないので残りは予冷用に使う事も考えたが家庭用冷凍庫の場所にも限りがあるのでキャンプ前に容量に余裕のある時限定かも。勿体無いが友人に使ってもらう事も考えよう。用途は一泊のキャンプなので翌朝の食材も冷えたまま保存できて問題なし。２５Ｌくらいのボックスなら一つを曲げて入れるくらいかな二つだと容量がかなり減ります。ソロでＭ４つは多すぎです。

4.06.2022

と**ち

微妙

その辺の安価なものよりは長持ちしましたが、記載のような時間は持ちませんでした。保冷ボックスに入れていて、半日は良かったのですが、24時間も持たず、、説明書も日本語のものが入っていなかったので検索して使用しました。日本語の説明書くらい入れてほしいと思いました。優しくない販売者だと感じました。

5.07.2022

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