The Respironics EverGo Custom Carrying Case protects your EverGo from getting dust and other particles in the interior of the concentrator. It is equipped with a handle strap and a shoulder strap allowing you to carry your concentrator multiple ways. If carrying the concentrator is not an option for you, the EverGo carrying case can slide directly over the travel cart. Through the Respironics EverGo Custom Carrying Case you are able to access every key component on your concentrator. There is a velcro flap covering one of your two battery slots allowing you to quickly and easily change batteries on the fly. To access the other battery slot, simply unzip the top of the case and you will see battery slot #2. The control panel is fully functional while the case is on your EverGo, allowing you to turn your unit on or off as well as adjust the flow rate without taking the case off. Whether you are looking to go on vacation or run some errands, the EverGo carrying case will make your life that much easier.