2 Ways Frozen，1 Collapse and freeze the small cooler lunch bag overnight (12 hours),2 Just freeze the gel packs（6 hours) horizontal before placing it into wall of the freezable bag, instead of freezing the entire bag that save freezer space and time. 

Once they’re frozen, Cerbonny's bag can keep food cool for up to 8 hours, depending on external temperatures.

As long as you don’t freeze it first,  Cerbonny bag will provide insulation to keep your hot items toasty-warm.

Cerbonny bags have freezable gel built right in to their walls, so all you need to do is freeze the bag. No additional ice or ice packs necessary!

Yes!Yogurt, salads,cut fruits, meats,veggies,sandwiches. Of course, it can also store snacks, medicines, lipstick, breast milk, insulin, and so on.Really anything that needs to stay cold!

Yes,it will close when you put a 12 oz bottle inside.