The bag can keep up to 6 milk bottles inside like Comotomo, Philips Avent, Evenflo, Dr. Brown, Tommee, Lansinoh, Nuk, etc, while keeping some diapers, fruits, snacks at the same time. Not only two layers of compartments, but also two layers of on the wall inside or outside, to organize better the stuffs. With removable middle layer, the bag can be used as one with double compartments or the whole compartment when the middle layer is removed. As high as a wine bottle, it is not only fit for baby stuff carrying, but also for wine, kettle, lunch box and so on.