4 Mid-Size Cooler Freeze Packs 10" x 10” The Coldest Pack at 18 Degrees F. No More Ice! Reusable. You Add Water & Save! - C.S. Brand Packs Have Over 4,000 Reviews Averaging 4.6 Stars - Safe USA Made

I love these and own literally tons of them for my Yetti coolers. They need two days (or longer) in the freezer but if you line a quality cooler like Yetti, Pelican, etc. with these they will keep frozen for 2-3 days which is impressive.Filling them with water and sealing is simple. I have friends who returned them afraid that they would mess it up but its literally the simplest thing ever.Update:I purchased these exactly one year ago, the bags are now falling apart. I didn't use them very often, I would guesstimate on a cumulative basis maybe 5-6 months total. All the bags are now deteriorating, and the gel/water mix has leaked out of some. Most of the bags delaminated (see pictures) and once the clear protective film is gone, that's when they puncture easily. The alternative is traditional hard plastic cooler ice, which seems like it would last longer but they take up a lot of cooler space and don't freeze as fast as Cooler Shock.

HEre's my real comparison: This 4 pack is supposed to replace 12lbs of ice. Before buying the cooler shock, I was using 8 frozen 32oz. bottles of water to keep things cool inside my insulation bag. When I left the bottles inside the insulation bag in the morning and came back in the evening, the temperature on the fermometer inside the bag read about 66 degrees. With 4 of these bags inside, the temperature in the evening reads 70 degrees.It's an okay product given the price and depending on what you are looking for. If your function is primarily to put ice packs in a insulated picnic bag which is PACKED tightly and you want to slide this along the sides, I'm sure it'll work fine. When there is open space in the insulation bag and the cooler shock is just placed inside loosely, it melts much faster. The cooler shock dips the temperature really fast but it looses its coldness sooner than a solid block of melting ice -Would I buy more of these? No. Instead I would buy a 48 pack of gel pouches for $14. I am getting a much higher volume of ice packs that way. I don't think cooler shock's technology is so good that it deserves the price it's asking for.

So a product review:Pros:1. Cost: Very affordable, especially when comparing to the Yeti and RTIC packs2. They work: they freeze colder than ordinary ice packs and last longer as well. I have a 60L rotomolded South Jetty Cooler (southjettycoolers.com). Put a number of these in my cooler this past Monday. The packs, while no longer frozen (4 days later), are very very cold. More importantly the beverages in the cooler are still frosty cold.3. Ease of Set-Up. These are mailed without any liquid in them. There is a chemical in the pouches, that when mixed with water turns into a gel. The directions were clear and it was very easy to fill the piouches up with the required amount of water, get the air out, zip shut, dry the fold by the zip top and iron to seal. If someone is not comfortable with filling and sealing these ice packs themselves, I believe you can ordered them filled for an additional cost.4. Space Saving: Since the exterior is not a hard molded plastic bottle, these are smaller and more flexible. Which makes them fit in the cooler better. The pouches as a very heavy duty Mylar too pouch. They feel as though they're pretty strong.Bottom Line: I would HIGHLY recommend these for your cooler. I have yet to come up with a Con. If I do, I will revise my review accordingly.Update 17Jun18: I’ve been using these for nearly 1.5 years now. At one time I had 7 of these in various sizes. Today, I still have 5. What does that mean to me, it means they’re durable. I use these a lot while hunting, fishing, boating, & traveling. They hold up well and will start to delaminate over time. But for the cost savings and convenience over ice, that’s OK; they’re made of a Mylar packaging, not Kevlar. I will definitely order more of these soon.

Great product... Easy to use and setup.I figured I'd buy a set of these to try out... I purchased the dry ones that need to be filled and sealed... Really easy to do and the sheet instructions that come with the packs are very detailed on what to do... And not to do... For me the important not to do was leaving water I'm the area you are gonna seal... When you heat it with the iron the water turns to steam and will not allow good sealing... But it was easy to work the moisture out and reseal... The others I went through with a paper towel and removed any water above the zip lock...Once sealed I put them in my deep freezer for about two days... To allow good freezing... I used a soft cooler that I also purchased on Amazon... Filled with 6 cold bottles of water and used two of the frozen Cooler Shock packs. I put the cooler in the back seat of my commuter car that I use for work... The car sits in direct sunlight for my 9hour shift. During the week of testing the ambient temperature got between 106 and 108 which would allow the interior of my car to get to at minimum over 150 degrees. I checked the packs after the first test day and they were still solid... Second day of testing the were softening but still freezer cold. On the third day the water inside was still very cold and the packs were back to a gel form... I would say that after four days in a hot car and not adding or taking out any of the contents the packs were cold but not as cold as taking a bottle of water out of a cold fridge... The test was very successful for running the same packs for 4 days... Alot cheaper than buying ice and dealing with the water leaks... I would highly recommend and the ones I bought came four to the pack... So if I had used all four I believe they would last alot longer... I am currently running two every two days in the same cooler to give the wife and kids an ice cold bottle of water after a long day of school... I have just been rotating two per day because I know they will have the Cooler open and lose some of the cold surface area of the cooler.

These Freeze packs are amazing, I looked at the video to see exactly what I had to do, which is very simple and straightforward. I work all around the country in the summer months at events on showgrounds and do not always have access to electricity so these are brilliant for keeping my cool box extra cold and found that they last well over the 48 hour period they state, marvellous would not hesitate to recommend them, they are far superior to the water freezer packs you usually use which only last hours as opposed to days. Make sure that you do the initial freeze for at least 48 hours as this really freezes up the reactive gel inside.

These are really on a whole different level. We used these to transport medical supplies and they kept everything frozen solid for the time we needed - ie 24 hours. Still no sign of thawing even then! Very impressive - would highly recommend.

I bought these for a festival to keep my food and beer cool for a couple of days. I put them in the cooler on Thursday and although they had thawed, the remaining food in the cooler was still cool on Monday! Two of the days were really hot so I wrapped the cooler in a sleeping bag but I don't know if it made any difference.Bottom line is these are far better than ice or the blue blocks.

These packs were bigger than I was anticipating, but they do the job perfectly. I have got one of those 'bar barrels' and these kept the drinks cold all night. Everyone was so impressed by them they are going to purchase some themselves. Much better than ice cubes around the drinks.

Arrives as open bags and you have to fill with water and then iron it shut. Straight forward to do.

They do exactly what they say. Little fiddly yo seal but once you get the hang of it they are no problem. Also handy for cool pads for bumps and scapes when they cool slightly and go back to gel.

Great product, bought to transport breast milk. Stay frozen for well over 24 hours.

A1+++++++++

Far superior to ice blocks

Lasted approx 9 hrs in a backpack to keep baby food/drinks chilled throughout the day in a 30oC+ heat in LA

Worked well

These were really easy to activate and the instructions were straight forward. They worked brilliantly on our first picnic day, looking forward to using them on our future camping trips, I would highly recommend this product.

I used these to help transport milk three hours away and it worked. Even kept it cool for a day!Totally worth it.

Very easy to use with clear instructions. Works brilliantly.

fab