How long do they stay cold
1735110
I put them in a gallon thermos jug for my husband to take to work and he said his water in the jug is cold almost the whole day and he's out in the FL sun and the jug is in the hot car all day. So I would say they stay cold for a good amount of time or at least in thermal thermos. I've never used them for anything else, just got tired of filling the ice cube trays nightly(don't have an ice maker) so he had ice to go in the thermos each day. Hope this helps.
1735111
they keep a drink cold for at least an hour if not more, havent really tried to time it.. They are awesome! i love these things :)
1711908
The insulin pens stay cool up to 12 hours. My husband also uses the cold blocks you can purchase at many drug stores. As the gel pack started to leak.
762929
That's going to depend on how you're using them. We used them to warm up baby bottles, ~4oz of very cold liquid, in a zippered insulated bag, took maybe 5-10 min to reach a warm, drinkable temp. If we left the warmer in the bag afterwards, it would still be noticeably warm upwards of an hour later (but not hot enough to completely warm up another bottle by then). Anything you can do to keep the heat contained will improve the longevity.
2243941
No more than a couple of hours, but your freezer may vary. I keep mine kind of cold, but I store these on the freezer door, so that has a tendency to affect things on my end.
81968
Not likely I would say it stays cold anywhere from 20-30 min tops then you need to throw it back in the freezer to cool it back down, which also takes about 30 min to make it cold again.
730220
They freeze overnight - I use them to keep fish cold on a cooler. They work great staying frozen most of the next day of kept in a cooler.
762931
Mine stay warm about 1 hour if I use them indoors and about 30-45 minutes if I use them outside in the cold.
1810026
yes BUT they do do not like srape things beside them,i use them to keep my insulin cold 1 will keep my insulin cold for 8-10 hours but remember they are small,perfect for a insulin carrying pouch
861459
They stay colder longer because of the silver backing. They are equally as durable.
2237765
I have not used it in the cold only in the hot simmer but they did last most of the day as long as I did not continuously go back and look at pictures or play with the settings.
973324
This size will stay warm for about 15 minutes when insulated against your skin. Larger packs will stay warmer for longer periods of time.
449519
I have had them on my back or laying on them for well over two hours and they were still cold. I had a three hour drive the other day and had them behind my back, they were still cold when I got there Tip, don't freeze them silver side together, they won't last. It is best if you can freeze them in different parts of the freezer so they don't touch, but I freeze mine white side to white side so the silver side is not touching them.
1968903
I have about a dozen of these that I have stored in my truck. I live in upstate NY where temps can drop well below freezing and into the single digits(both positive and negative) and have had them in there for about 3 years now. They freeze solid every winter and thaw every spring. None have popped.
296850
About 45 minutes and it will be cold again. For it to be completely refrozen a couple of hours. Having two allows you to alternate them without having to wait. I have three.
730219
In a closed freezer (assuming the power is on) they would last indefinitely- with the power off, I would think they would last weeks assuming the freezer is in a cool spot indoors.Freeze them as long as possible, at least 24 hours works best for me. But they do freeze in about 3 hours or so.
1080885
I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still cold. Hope this helps. I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still... » Read More I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still cold. Hope this helps. « Show Less
1628133
The ice pack stay cold for like 3 hours, but it is really good. Stays in the place and it is not aggressive cold.I recommend.