Philips Respironics have understood that many people travel with their CPAP machines and often don't take the humidifier with them. They have created a specific hard backed case which is designed to make travel easy. This pack is small and durable to protect your machine and is perfect for the regular traveller. It comes with an extra power pack that is designed to run the machine and not the humidifier. This also has room for your tubing and mask and is great for those on the run.