This is useful especially if you are away from home. For me, I use Tiger brand which is lighter, small size and cheaper, about $20 and the hot water can last up to 10hours. You can make milk easily using the hot water instead of warm it.
Essentially, it's just a thermos flask with a plastic cover and cap. You can store clean water inside and use it to make your baby's milk as well. It's kinda heavy though, but good if you'll be in places with no hot water dispensers.
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This is good I have it. can buy at most departmental stores
thanks