You never know when you are going to need an additional battery, or even when you are going to need the AC or DC power supplies. Which is what makes the accessory bag so vital—it is designed to hold extra batteries and the AC and DC power supplies with additional room for some personal items. You can choose to carry the accessory bag around by the carrying handle, or you can have it on the travel cart leaving your hands more accessible for other tasks. You will never want to leave the house without the accessory bag by your side again. This convenient storage solution ensures all your essential oxygen accessories are kept in one organized location, ready whenever you need them for seamless oxygen therapy management at home or on the go.