How does one go about heating the pack? and how long does it stay warm?
1321579
A microwave oven, probably 20-40 seconds, depending on the power of the oven. It should stay warm for at least 10 minutes. A possible alternative is a hot water bath.
1635524
Press and hold the button when plugged into your jacket/socks,,, whatever your product is. When all the lights are lit, it runs the hottest and the battery last the least amount of time. There are 4 heat settings, changed by again pressing the power button. The lowest setting will last about 8 hours, the hottest between 2-4. To turn off, bring the battery to one step below the lowest heat setting for the battery style that does not have a slot on top. For the kind with a slot on top, press and hold the power button on any heat setting to shut off. Manufacturer recommends always keeping batteries charged. Press and hold the button when plugged into your jacket/socks,,, whatever your product is. When all the lights are lit, it runs the hottest and the battery last the least amount of time. There are 4 heat settings, changed by again pressing the power button. The lowest setting will last about 8 hours, the hottest between 2-4. To turn off, bring the battery to one step below the lowest heat setting for the battery style that does not have a slot on top. For the kind with a slot on top, press and hold the power button on any heat setting to shut off. Manufacturer recommends always keeping... » Read More Press and hold the button when plugged into your jacket/socks,,, whatever your product is. When all the lights are lit, it runs the hottest and the battery last the least amount of time. There are 4 heat settings, changed by again pressing the power button. The lowest setting will last about 8 hours, the hottest between 2-4. To turn off, bring the battery to one step below the lowest heat setting for the battery style that does not have a slot on top. For the kind with a slot on top, press and hold the power button on any heat setting to shut off. Manufacturer recommends always keeping batteries charged. « Show Less
1579243
They heat up by bending the "coin" in the pack. Once the now solid pack is no longer warm, you boil it for 6 minutes and it turns liquid again. I don't know about putting it in the microwave to turn it back to liquid and make it ready to activate again but because the "coin" is a thin metal, I imagine you really wouldn't want to.
716972
I usually did 2.5 minutes. It has directions (I think they are printed right on the thing so you don't forget). Just make sure you put it on a clean wash cloth before using your microwave to heat any of these type things...even a tiny bit of food on the wrap will super heat and burn a hole in the fabric. This is the way I have ruined several of these before I started using a clean wash cloth under it.
389760
For initial first time use of the hot packs, soak them for two hours and then you can leave them in cool water without a problem. For infrequent use, place the moist hot pack in a sealed plastic bag and keep it in the refrigerator at all times. The hot pack should never dry out or it will be permanently ruined.
601477
It's a one time use product. They are air activated so once you remove one from its pack it will begin to heat up immediately. They last several hours though.
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.
1199048
I used ice packs. They worked pretty well. A thought, though: I would keep a napkin or paper towel handy. Packs have a tendency to "sweat" as the day progresses and it helps to keep the bag clean.
1367034
Its like a gel pack - You put it into the freezer - It will freeze down the part of your back to were it gets numb so be care full I leave it on for 1/2 hour and wow nothing like itHavent used the warm part - You just stick the same Gel pack into the microwave Iam sure it will work as well as the coldThe pack has like 4 chambers its used either for heat or cold
458036
What works best for me is to cover the packages (cut to the size you want) with cold water. I let the packs soak for aboot 15 mins. and then knead the packs while in the water. This will remove all of the trapped air. Then let them soak for another 10 mins. Place the packs in the freezer until completely frozen.
788596
According to the directions I read, they will not stay warm that long. There are hand warmers that will stay warm up to 8 hours and you don't have to boil them, but they are not reusable.
1652231
I have not tried it heated. I usually like the pack cold because I have back problems and this reduces inflammation. I am sorry I could not help, however, I think I will try it later on today and let you know how the pac is heated.
1387628
Hello! I'm not 100% sure about heat as my sons school asks we not pack up items to be heated but it stays cool for about 2 hours. Longer if we place an ice pack on the exterior lunch box we purchased. Hope this is helpful!
1998444
No, it won't work. It's impossible to quantify that answer, because you don't specify how much current you will draw and for how long. Generally speaking, it's always better to conserve heat than try to make more. So get a good sleeping bag; that is the appropriate technology. Then you will still be warm in the morning.
1186841
After you fill the unit with lighter fluid put the small cap back on. Then hold a flame to that part for about 1 min. Replace the lid and put in bag. It should stay warm for many hours. I hope this was of help. It took me a bit to understand how to work it.
171415
I have kept food warm for 2 hours...and I use the insulated pyrex portable containers.
2255792
yes, you can put hot food on it. You heat the pack in the microwave and then I put it in my carrier. The hot pack and my food stayed warm (not hot) for more than 8 hrs.