How big is a 500 Liter bag? How much space does it occupy?

When fully inflated, the size of a 500 Liter Oxygen Reservoir Bag is 4 feet tall, 3.5” feet wide, and 3 feet deep. You can mount the bag horizontally or vertically. The Bag is equipped with grommets on all four corners. You can use S hooks to attach it to the ceiling or the optional Bagstand. We recommend buying the Optional Bag Stand, but if you have provision to hang it either on the ceiling or other options, you can do so as well.