Cool bag questions

[SnuggyBuggy]

This might be an odd one but do you get cool bags that can safely store made up bottles of formula for around a 12 hour period in a backpack?

You'd need to pack with ice packs etc as well but probably up to 6 hours is more realistic

Thanks. I was asking because I'd spent the day with a friend who just seemed to be getting bottles out of her bag for the whole day and wasn't sure if that was safe or not.

Then I remembered those cartons and that she was probably using those

In a cool bag with ice packs, made up formula can be stored for 4 hours. Unless she used cartons, in which case they last ages until opened