Cooler Shock Reusable Ice Packs for Cooler - Long Lasting Cold Freezer Packs for Coolers and Lunch Boxes - Cooler Ice Packs for Camping Gear, Fishing, Road Trips, Beach Must Haves

I use these for a terrarium containing orchids that I need a large nighttime temperature drop. I place them on the outside of the terrarium then use a fiberglass insulation blanket coated in silicone. I'm able to get a 20 degree temperature drop easily and the packs stay cold for 12 hours. If anyone reads this is doing similar for plants, make sure not to place these inside the terrarium unless they are far away from the plants or you'll risk cold damage to the leaves.Great product, easy to set up, they freeze fast...maybe 4 hours maximum, and stay cold!

These are a game changer when going on the boat and putting in cooler for food and drinks. I have both the smaller size and larger size. They last a good 8 hour day with only minimal melting. My husband like ice for his beer, but I put the other drinks with these. Great product. Keeps everything very cold.

Why I bought: I needed something to keep my food and drinks cool for when I go mountain biking, golfing, or just packing simple lunches for myself, my wife, and my daughter. This is a really ingenious idea that allows for reusable, compact, ice packs that last a long time. My first purchase of these were in 2020 and they are still usable, 5 years later. I even bought smaller ones for small lunch boxes. The set up process is really easy and takes maybe 5-10 minutes and it comes with instructions.Highlights:- Variety of sizes and options- compact- stays cold for long periods- easy set upLow lights:- the edges can be a little sharp so just be careful

So... I didn't realize these ice packs worked the way they do. I THOUGHT this was a reusable pouch that I could fill with water, freeze, use to keep items cold and then empty out the water and store flat until I needed it again.We were having a scheduled power outage and I thought ice would help keep the fridge cooler longer while the power was temporarily out. Since this is the second scheduled outage recently, I thought buying a pack I could store flat in a drawer would be ideal since freezer space is at a premium. I already have two hard plastic ice packs that take up room.The arrived the day of the outage, leaving me with not much time to fill up and freeze one. Worked great in tandem with the other plastic ice packs. Fridge stayed cool enough. We haven't noticed any spoilage of fridge contents. (This pack wouldn't stand up, so I actually placed one of the hard plastic packs in between two gallons of milk which I think was key.)Today, I go to empty out the pack, so I could store it flat. I squeeze out a little of the gel thinking it was just a frosty cork, and only then did I realize what was going on.I showed a friend the pack and asked how they thought it worked, and they too thought it was a water-in-water-out situation.I'm now thinking I ruined the pack. I didn't measure the water. I didn't release air bubbles. I didn't shake it. I didn't install the cork. Its a bit rounded with how I filled it. And didn't have the room to freeze it perfectly flat. I guess I know for the next two, should I ever use them. At this point, I'm hoping this thing can live outside my freezer and that it doesn't ruin the functionality of the gel because it takes up a lot of space and I don't need giant ice packs regularly. I wish I had ordered the smaller version as I'd get more use out of those for trips to the grocery store, etc. I don't even have room to freeze 3 of these things at once.So, don't "just add water" like I did. There's rules for this thing. Also, instructions say to freeze the packs 24-48 hours before use, so this isn't a last minute solution (like ice) either.I'll have to do a real test, but I'm not sure they performed better than the hard-plastic packs I already had. I prefer the usability (flat, standup, lay down) of those, but if these Cooler Shock bags do stay cooler longer, than thats obviously an important feature.Anyway, works great, I guess. I agree its less of a watery mess than 6lbs of ice and lasts longer, but its a solid, slick block. Unlike ice, you cant nest things into it, like cans or bottles. I imagine it would take longer than ice to cool any items that aren't already cold due to potentially limited contact. I see some people use these packs to keep the ice in their coolers cold, which is pretty funny. Oddly, that makes sense!

Technically speaking, I'm not convinced these packs would be capable of keeping things chilled for a full 48 hours. BUT they do say 24-48 hours, so I'm not deducting a star for that reason. I recently purchased these and used 2 in combination in an icemule jaunt to take refrigerated medication on a long flight followed by a drive before we'd reach refrigeration again. All told, I needed something could 1) stay frozen through TSA, and 2) keep my meds cool for 18 hours+. This system worked perfectly! All of my meds remained perfectly cold. The packs were slushy after 18 hours (including 90 degree temps for a few of those hours, BTW), but still plenty cold.Throughout our trip, we'd just pop the packs in the freezer of whatever rental we were in to have them ready for the next day. They worked reliably, including during long road trips in 90 degree weather. We only had one hiccup along the way when a hotel's minibar fridge/freezer apparently wasn't cold enough to refreeze them. Luckily, their kitchen agreed to pop them in their freezer while we were out sightseeing for a bit. We were back 3 hours later and had partially frozen packs--they do freeze pretty quickly. Our return flight was delayed, we missed our shuttle, etc, yet we still returned home with cold med in hand.Though I never had an issue with my meds freezing while next to the packs, others have mentioned it could happen. Twice when on longer road trips from one location to the next, our ground beef actually froze when between the packs! So, do take care if this is a concern.We've had to travel with refrigerated meds in the past, and these packs in combo with the icemule were by far the best system and most reliable. Won't hesitate to use them again!