Can these be used for repeated heating in a bottle warmer, or are they merely for storage? I'm concerned about the lids holding up in the heat.
226463
Hmm...I love these because I heat the food in the jars in the microwave (not with lids, I never put plastic in the microwave-I cover with paper towel). However, the lids do hold up in the dishwasher. I'm not sure if that answers your question, but I ended up buying two sets because I use them so much.
226464
I never heat with the lid on. When I want to warm the food contents, I boil a pot of water and then place the uncovered glass jar in the pot once the water is boiling hot. Then I just stir the food content to distribute the heat evenly. I've been using these jars for about 4 months now and they've worked well.
226465
Lids are straight up plastic. We typically heat baby's food in bottle warmer / steamer without the lid and it works fine. If you feel the need to heat with the lid on, they are probably better as storage. Hope that helps.
930622
They have been known to leak. I have discovered that if I heat the lids before tightening, the plastic will become malleable and I can tighten them further. Then, when they cool, the plastic shrinks and the lid will be tighter and not leak.However, just for picking up and shaking a drink, I have not had a leak with something like that. When they leak usually it's a very small seep.
432648
Yes mine were constantly used in our bottle warmer and were also fine for heating in the microwave
1161940
I also use them in a safe. The reason for the heat sealing is to keep the rest of the packets from absorbing moisture from the air until you use them. I keep mine in a good sealed zip lock bag and make sure I get the air out of it. so far no problems. Hope this helps
1859022
Hi. I never used a bottle warmer, but i did take cover on and off frequently. It is pretty durable and did stretch a bit, but hasn't enough to not fit anymore. This was for my oldest who used these heavily until he was 2.5 and my current 1 y/o. Not sure what repeated heat would do to them but they are very sturdy. Hope that helps!
345713
I use them in my microwave all the time, but just for reheating, never over a couple of minutes. Never had any issues with melting.
1473573
I have put them in fridge, microwave, and dishwasher without any issues. Also, I have found silicone lids which make them a brilliant storage solution.
927557
I never tried a bottle warmer, but they wash well in the dishwasher. Not sure if that helps, but the dish washer gets pretty hot so it might be okay.
611900
I'm not sure about putting them in a jar and it will keep them from staying warm. I do however know that they take a few minutes to react and they will stay warm for a long time. While visiting Canada in the winter I was able to use the hand warmers for two days in a row; meaning they stayed warm (pretty hot) overnight and I was able to still use them the following day.
2059858
I don't know the correct answer, I don't use the lids in the oven, microwave or dishwasher (don't have one), I do use them in the freezer and so far they do great. I will tell you they are the best storage containers I have ever purchased. I wanted to wean myself off of plastic and they fit the bill. Bought them for a friend as a gift and he loves them too.
637531
No, these are definitely not made to hold hot foods. For chili or soup, you would be much better off with styrofoam or waxed paper containers.
1136756
I've never used them in the oven, but they are safe in the microwave, which can heat up food to a fairly high temp. The lids are definitely not safe in an oven, but, I would think that the glass could handle lower temps. To be sure I would try contacting the company.
149754
Unfortunately, putting it in water is really the only way to successfully heat these. I personally didn't have a problem heating them that way. Can't put them in a bottle warmer (they will leak all over). Horrible bottle design, which is why I stopped using them. Too bad. The nipples are great.
1029970
I have used hundreds of these lids. Haven't tried to reuse them but don't see why it wouldn't work. What can go wrong? Good luck.
960405
These are very good a storing dry goods. Since the lids are watertight they hold in the product's freshness very well. As will any dry goods though, make sure that you eliminate as much oxygen as possible. Adding oxygen absorbers and/or flushing the container with nitrogen is recommended.
1206331
Good question, I haven't tested them in those conditions yet. However, because they are sealed foil pouches I would think they would do better than plastic bottles under those conditions. Heat is no friend to any perishable in car temperatures, but I would expect these would be better than nothing to have in your trunk JIC.
2265347
Happy to answer your questions, Steve. I use them in the freezer all the time but don't drop them! They'll break pretty easily if frozen (especially when filled up with frozen goodies). You didn't ask but I'll offer that I'm very careful when heating something up with these in the microwave. Defrosting, yes; warming, sure; getting something pretty darn hot? I've done it successfully and nothing's melted yet, but I'm cautious.