The model 'Big' bag has a huge capacity – 21 liters – and can also form as a family bag. The bag can store either four baby bottles, or two 1.5 liter bottles. It's suitable as a bag for twins, as well. The bag's volume is perfect for carrying on your back and can be attached to any kind of stroller. The bag can be washed in a washing machine. The bag comes with a diaper pack, which includes a diaper bag and a unique changing pad.