An inflatable patient transfer device, comprising: - a first side for contacting a surface, said first side extending from a head section to a foot section and including a perimeter portion, an inner portion and a plurality of apertures formed therein; - a second side for contacting a patient, said second side extending from a head section to a foot section and including a perimeter portion and an inner portion; - at least one baffle interconnected between the first and second sides so that the at least one baffle is disposed between a lateral edge of the first side and a lateral edge of the second side, the at least one baffle including a bottom edge adjacent the first side, a top edge adjacent the second side, and first and second lateral edges,; - a first pontoon portion forming a part of the perimeter portion of the first side and forming a part of the perimeter portion of the second side; and - a second pontoon portion forming a part of the perimeter portion of the first side and forming a part of the perimeter portion of the second side; wherein the patient transfer device is moveable between: - an unloaded state in which the perimeter portion of the first side is in contact with the surface, the inner portion of the first side is spaced a first distance away from the surface and the baffle top edge is substantially linear; and - a loaded state in which the weight of a patient causes the perimeter portion of the first side to be in contact with the surface; characterised in that: - in the unloaded state, the baffle bottom edge has a substantially concave shape relative to the surface between the first and second lateral edges (38, 40) so as to promote a downwardly concave shape of the patient transfer device when in an unloaded state; and - in the loaded state, the weight of the patient causes the inner portion of the first side to be spaced a second distance away from the surface, wherein the second distance is less than the first distance. - a first side for contacting a surface, said first side extending from a head section to a foot section and including a perimeter portion, an inner portion and a plurality of apertures formed therein; - a second side for contacting a patient, said second side extending from a head section to a foot section and including a perimeter portion and an inner portion; - at least one baffle interconnected between the first and second sides so that the at least one baffle is disposed between a lateral edge of the first side and a lateral edge of the second side, the at least one baffle including a bottom edge adjacent the first side, a top edge adjacent the second side, and first and second lateral edges,; - a first pontoon portion forming a part of the perimeter portion of the first side and forming a part of the perimeter portion of the second side; and - a second pontoon portion forming a part of the perimeter portion of the first side and forming a part of the perimeter portion of the second side; - an unloaded state in which the perimeter portion of the first side is in contact with the surface, the inner portion of the first side is spaced a first distance away from the surface and the baffle top edge is substantially linear; and - a loaded state in which the weight of a patient causes the perimeter portion of the first side to be in contact with the surface; - in the unloaded state, the baffle bottom edge has a substantially concave shape relative to the surface between the first and second lateral edges (38, 40) so as to promote a downwardly concave shape of the patient transfer device when in an unloaded state; and - in the loaded state, the weight of the patient causes the inner portion of the first side to be spaced a second distance away from the surface, wherein the second distance is less than the first distance.