My friend recently purchased Pacific Baby, which is a thermal milk bottle. This helps to keep the milk at a constant temperature for at least a few hours and you can also feed directly without having to mix milk powder and water when you are outside. The downside is that it is rather heavy. http://www.amazon.com/Pacific-Baby-Bottle-Blueberries-Ounce/dp/B0085P4Z6M/ref=sr_1_6_s_it?s=baby-products&ie=UTF8&qid=1451399202&sr=1-6&keywords=pacific+baby
It is not encouraged to keep your milk warm for a prolonged period of time as it encourages the growth of bacteria. If you need to bring out your milk for an outing, please bring it cold in a cooler bag then warm it up only when your baby is going to drink. I use a Tommee Tippee travel bottle & food warmer to bring hot water out to heat up my milk. If my baby doesn't finish the heated milk within an hour, I will discard it.
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thanks