Hi there, I have a 10 days baby and I have been breastfeeding, with small exceptions when we had to top up with formula, or ocasionally one feed overnight with formula. I am not comfortable enough yet to breastfeed while out and about so I will either express milk or use milk powder, anyway, I read the best way to make a bottle of milk powder is to have a flask of hot water, a cup of measured milk powder and the bottle sterilised, my question is can you recommend a good flask that will keep the water hot?