[USB PORT FOR MORE CONVENIENCE]There is an USB port on the side pocket. You can connect the USB cable to your power bank and put it in the side pocket then click the heating function button. It will keep you milk bottle warm. It is much more convenient when you are outside. [LONG-LASTING HEATING WARM MILK, FRESH AND HEALTHY]Our backpack diaper bag has a unique heating function, which can keep the baby bottle at 104-113 degrees Fahrenheit for 6 hours-the best temperature cited by the baby. Plus, our diaper bag has two thermal pockets so that you can store two bottles of milk in it. There is an insulation function button. Click it after you put the milk bottles in the thermal pockets. Your baby can drink warm milk anytime and anywhere. [LARGE CAPACITY WITH MULTIFUNCTIONAL COMPARTMENTS-EASY TO ORGANIZE] Size: 10.2 inches x 7.9 inches x 15.4 inches. This 20L diaper backpack has 15 inside and outside pockets. You can put milk powder, towel, toys and anything else in the big main compartment. And the inside pockets are ideal for storing wet wipes and diapers. Our outside tissue pocket has a hole so that you can draw a tissue without opening the bag. This diaper bag is spacious enough to put all the baby stuff in it. [MULTIPURPOSE AND VERSATILE ]The diaper bag can be used as a backpack, handbag, shopping bag. And it can be hooked on the stroller. It will relieve your fatigue during looking after your baby. Plus, the apearance is very exquiste and we have three stylish color choices. Suitable for both mom and dad. It won’t looks like too much of a mommy bag, suitable for shopping, travel, picnics and other occasions