An apparatus to provide negative pressure to a wound site comprising: a top layer, a bottom layer and an intermediate layer, wherein each layer is constructed from a flexible, liquid impermeable material and is adhered to one another, wherein each of the layers has a proximal end and a distal end and an elongate portion extending therebetween; an upper fluid passage at least partially defined between the top layer and the intermediate layer, the upper fluid passage having a proximal end and a distal end, wherein the upper fluid passage comprises an upper channel spacer layer positioned between the upper and intermediate layers, and wherein the upper fluid passage is configured to provide air from an air leak toward the distal end of the upper fluid passage; a lower fluid passage at least partially defined between the intermediate and bottom layers, the lower fluid passage configured to be in fluid communication with a source of negative pressure, the lower fluid passage comprising a lower channel spacer layer positioned between the intermediate and lower film layers; and characterised in that: a first opening and a second opening in the distal end of the bottom layer, wherein the first opening is spaced apart from the second opening, wherein the first opening is fluidically connected to the upper fluid passage and the second opening is fluidically connected to the lower fluid passage, and wherein the upper fluid passage and lower fluid passage are fluidically separated from each other. a top layer, a bottom layer and an intermediate layer, wherein each layer is constructed from a flexible, liquid impermeable material and is adhered to one another, wherein each of the layers has a proximal end and a distal end and an elongate portion extending therebetween; an upper fluid passage at least partially defined between the top layer and the intermediate layer, the upper fluid passage having a proximal end and a distal end, wherein the upper fluid passage comprises an upper channel spacer layer positioned between the upper and intermediate layers, and wherein the upper fluid passage is configured to provide air from an air leak toward the distal end of the upper fluid passage; a lower fluid passage at least partially defined between the intermediate and bottom layers, the lower fluid passage configured to be in fluid communication with a source of negative pressure, the lower fluid passage comprising a lower channel spacer layer positioned between the intermediate and lower film layers; and characterised in that: a first opening and a second opening in the distal end of the bottom layer, wherein the first opening is spaced apart from the second opening, wherein the first opening is fluidically connected to the upper fluid passage and the second opening is fluidically connected to the lower fluid passage, and wherein the upper fluid passage and lower fluid passage are fluidically separated from each other. a first opening and a second opening in the distal end of the bottom layer, wherein the first opening is spaced apart from the second opening, wherein the first opening is fluidically connected to the upper fluid passage and the second opening is fluidically connected to the lower fluid passage, and wherein the upper fluid passage and lower fluid passage are fluidically separated from each other.