Dynarex 4517 Instant Cold Pack with Urea, 4"x5", Pack of 24

I brought these camping because I struggle with overheating after recovering from covid. (my oxygen goes down when I'm too hot). I was pleased with how well these worked. They only stay cold for maybe 20 minutes, but when they are cold, they are surprisingly cold. I didn't even have to use the whole pack either, so I packed them away for the next camping trip. (I used one in the cooler too, and if insulated they actually stay pretty cool for a few hours, they are a great option to keep your food cold too!)

I donated a box of these to the MMA gym my 11 year old daughter goes to. A few days later someone hurt their ankle in her class and the coach got one of these and punched it while it was in his palm to activate it. The girl that was hurt used the instant cold pack for about 20+ minutes. That is good enough for me in my books.

These are horribly difficult to get the inner pouch to burst. I have strong grip strength and I couldn't get it to burst no matter how hard I squeezed. Cannot recommend to anyone. These are a waste of time and money.

UPDATE: I’ve had a few of the packs leak before even activating which caused a sticky mess in the sports bag I use. It’s easy but annoying to clean - I’m just glad it’s non-toxic. I’ve learned to put the packs in Ziploc bags now, which has helped with that specific issue. I’ve used up my entire box of 24 and I’m still planning on ordering more of this brand. Still keeping at 4 stars.ORIGINAL REVIEW: I bought a box of these so I can bring some with me to my kids’ sporting events. They have already come in very handy for both baseball and flag football. Between my son, his teammates, and even opposing players, I have used up at least half a dozen! They are compact, easy to pack in a sports bag, and easy to activate (I just smash it against something or use my fist). I gave it four stars because they don’t seem to stay very cold for a long period (for what I would expect) but I guess it could be somewhat due to their compact size. Overall, they work great for what I bought them for and I will definitely purchase more!

These work great. I bought them to take with us to theme parks and Bike Riding in florida. They stay cold for about 15minutes. It a good way to fight off heat stroke and keep my Kiddos Cool. These with a cold drink are a perfect way to stay cool when your out and about. Great Price for Great Product

They are difficult to "pop", it says squeeze,but there's so little stuff inside you can't just squeeze it to pop it, you have to slam it between your hands. Also, it only stays cold for about 5 minutes. I wouldn't buy again.

Great instant ice pack and just the right size to form around a shoulder, knee, hand or also at the back of the neck for a headache. They stay cold for about thirty minutes. I have tried refreezing them and it does work but it's not as formable and gets very hard.

Quick acting, these get real cold instantly. Break the reservoir inside and shake up. The packs are small so they don’t stay cold for too long but do their job well enough for their size.