Prince Lionheart On-the-Go Bottle Warmer with Insulated Bottle/Food Bag

This product is amazing! I just ordered 2 more so I have a total of 4. I bought them to use at a music festival, so we can warm bottles when we are away from camp. They got a test run at a convention this weekend and they were stellar!I read the reviews and purchased NARROW NECK GLASS BOTTLES to use with it. These pads will not fit wide neck bottles. Additionally, I did some research on thermal properties of glass and plastic, and learned that glass conducts heat 10x more efficiently than plastic. Translation: contents will warm faster in a glass bottle than in a plastic one.It took about 30 minutes to make a fridge-cold bottle lukewarm and about 20 minutes for room temperature.PLAN AHEAD. If you are travelling, pop this warmer 30 minutes before you anticipate feeding your kid. I fed my baby with the bottle still inside the warming pack with sleeve. It's a little bulky and heavy, but the bottle stays warm that way. Going back to the thermal conductivity of glass - glass bottles cool off faster than plastic. So keep it in there while feeding or you won't be able to rewarm the bottle. It's worth it.Finally, back to planning ahead, these are one time use and you will have to reset them by boiling for 15 minutes at home. This is clearly laid out in the description. Don't complain in the reviews about it when you should've known in the beginning. Order more if you think you'll need to make more than one bottle on any given outing. Make sure you follow the directions and you won't have any problems with resetting them for the next use.

The case's zipper broke after one use. I now wrap a dish towel around it to keep it warm. I leave a bottle ready to go for my Husband in the morning, so it stays warm at least 2 hours when sealed. I usually warm the milk in water first then transfer over to the case. The smaller the amount of milk in the bottle, the better it will warm.

This is the best by far of these types of warmers. I have this one and two other brands; this is the only one that works very well. (In fact, I've had this one for six years--the others haven't lasted 3 years and in the case of two, 2 months.) The others go off prematurely because the encasements are soft-sided. This encasement is hard-sided, so it protects the disc inside (which is how you activate the heating crystals.) Two of the others burst so the gel came out--I think they were just cheaper. This one seems more well-made. I do not keep my bottles inside this until I'm ready to warm them--doing so can cause it to activate. Also do NOT warm your Dr Brown's bottles with the "straw" down inside--the milk will flow up the straw and leak out (even if you have the little white plastic disc in there.) Instead, keep the straw and nipple in a separate baggie and just use the hard cap until the bottles are warmed. Then put the bottle together to feed baby. In all, this is one of my "must-have" products, and even though I'm six months away from not having any more bottles to warm, I'm ordering a second. (In my defense, I do have twins to feed this time around. ;) NOTE: If you are traveling on a plane, the flight attendants will warm your bottles for you--they will put them down inside cups of hot water. Also, I've gotten cups of hot water for tea at airport coffee stands and put my bottles inside those to warm. So, save these for when you're in a car or something and have no alternative. Most people are MORE than happy to help you warm a bottle, esp when you're traveling.

Once you understand how they work, you can use them quite effectively. I bought two of the Lionhearts for flying cross-country (very limited formula-warming options) with my 7 mo old. I scoured the Web for reviews and found they were 50-50, for/against; decided to give them a try. No, they don't heat a bottle from refrigerator-cold. Yes, from room temperature (such as the sealed, 6 oz. travel bottles of Enfamil that I brought) in about 20 minutes. For car travel, the best system I've found is to insert an already-warm bottle in the UN-activated sleeve; when the bottles are starting to cool, activate the crystals to keep the bottle warm for up to 3 more hours - longer if you keep the warmer itself bundled up in something. Right when you get to your destination, boil down the crystal-filled wraps again so they're ready to go next time. It's really no big deal. It's somewhat easy to trigger the chemicals by accident, so just handle the warmers gently. All in all, these work quite well for what they are -- especially in the absence of ANTHING ELSE out there. Note the zipper doesn't 'quite' go over the top of Dr. Brown's bottle caps.

I was skeptical at first but very pleased with out quickly it warmed up my bottle. I would like thr zipper to be reinforced, maybe some flexibility would be nice as if it's a fatter bottle it's hard to close. Zipping it shut is for best results. It still warms if unzipped, but not as fast.