Army surplus latest british issue sleep mat. When the nozzle is undone the mattress gradually inflates itself. When fully inflated simply close the nozzle tightly for a comfy sleep mat.
If more air is needed simply blow into the valve until fully inflated. To pack away undo the valve and roll up tightly,once deflated tighten the valve.
When inflated it will provide a mat for the head down to below the hips with a length of 116cm.