Fluid fillable, variable volume chamber

A fluid-fillable, volume-variable body consists of two superimposed, preferably welded together, along the peripheral edge, preferably welded foils, which also form a hinge region, along which hinge region the foils are folded to form two at least partially superimposed portions of the inflatable body, and wherein at least one connecting channel, which possibly passes through the hinge region, is formed between the two subregions of the fillable body by the foils. In order to minimize the overflow resistance between the subregions of the body and to ensure the easy and smooth fluid exchange even at low pressure difference, at least one element (7, 9) is provided in the course of the connecting channel (4), which also deaerated the films Condition of the body (K) over at least a part of the width of the connecting channel (4) spaced.