Feature: 1. good insulation function, keep your food fresh longer 2. Enough capacity to spend food for school, work, camping. 3.Isolated function helps keep your food warm or cool. 4. Adjustable shoulder strap, gives you two options to carry the bag as a handbag or shoulder bag. 5.When you don't use the cooler bag, you can fold it to a size smaller than A4 paper so that the bag does not take up too much space