Doesn't keep a bottle warm for a long time
These are just ok. They're a good size and the Velcro handle was handy, I put the Avent natural bottles in and they fit well but the bottle only stays warm for a couple of hours. I found putting a bottle with boiling hot water at 8am it was a little more than luke warm by the mid afternoon feed. It's better than nothing at all, maybe I have unrealistic expectations? As long as your baby doesn't mind very cool bottles these will work, they're not too bulky or heavy, just unfortunately not great for my baby who loves a really warm bottle.