How big/large is the reservoir?

The dimen­sions of the reser­voir are 60″ length x 80″ height x 3″ depth (unin­flat­ed). When inflat­ed, the reser­voir depth increas­es to 24″ and the reser­voir is shaped like a giant pil­low. For hang­ing the reser­voir you will need about 5 feet of open wall or ceil­ing space with a hang­ing height of a least 6–1/2 feet and 2 feet of work­ing clear­ance when the reser­voir is ful­ly inflat­ed. When ful­ly inflat­ed the reser­voir holds over 600 liters of oxy­gen con­cen­trat­ed air at a pas­sive pressure.