I'm pretty disappointed with the Therma-Bag. I have seen many Philips Avent products, all of which are super. But the promise of vials filled with water four hours keep warm, could not be complied with. Even if one fills the fresh water from the boiling kettle, it holds up to 2 hours warm enough to order a bottle can even touch. Since you but sometimes longer go, you're standing on the hose, when you have no possibility of another heat option. I have therefore now bought a 0.5 liter thermos, which is safer. Unfortunately, the Therma-Bag is not exactly been favorable. Time to test whether they might drink keeps better cold in summer ....
