The GCE Zen-O Lite Rucksack Backpack allows you to enjoy hands-free operation that gives you use of both arms. Instead of draping your Zen-O Lite over one shoulder or across both, you can balance the weight between both your shoulders thanks to the adjustable shoulder straps. The backpack protects your Zen-O Lite from everyday bumps and scratches. When your unit is secured in the backpack, you will have full access to the control panel to quickly change your oxygen settings, view your remaining battery life, and adjust your flow rate without having to remove your concentrator. You will also have full access to your batteries. The durable and lightweight backpack will prevent scratches, dings, and bruises from showing on your concentrator, and you can keep your unit in the case 24/7 without worrying about overheating thanks to a mesh fabric.