A system for providing negative-pressure therapy to a tissue site, the system comprising: an absorbent (324, 424); a sealing layer (310, 410) configured to cover the absorbent (324, 424); a blister (304, 404) having flexible walls and fluidly coupled to the absorbent (324, 424), the blister (304, 404) having a collapsed position and an expanded position; a first check valve (344, 444) fluidly coupled to the absorbent (324, 424) and the blister (304, 404) and configured to prevent fluid flow from the blister (304, 404) into the absorbent (324, 424) if the blister (304, 404) is moved from the expanded position to the collapsed position; and a second check valve (350, 450) fluidly coupled to the blister (304, 404) and an ambient environment and configured to prevent fluid flow from the ambient environment into the blister (304, 404) if the blister (304, 404) is moved from the collapsed position to the expanded position, wherein the blister (304, 404) comprises an enclosure forming a chamber having a fluid inlet (342, 442) and a fluid outlet (346, 446); a biasing member disposed in the chamber and configured to bias the blister (304, 404) to the expanded position, wherein the fluid inlet (342, 442) is fluidly coupled to the first check valve (344, 444) and the fluid outlet (346, 446) is fluidly coupled to the second check valve (350, 450); wherein the biasing member is a foam; wherein the foam comprises: a first foam (334, 434) having a first compressive force deflection; and a second foam (335, 435) having a second compressive force deflection. an absorbent (324, 424); a sealing layer (310, 410) configured to cover the absorbent (324, 424); a blister (304, 404) having flexible walls and fluidly coupled to the absorbent (324, 424), the blister (304, 404) having a collapsed position and an expanded position; a first check valve (344, 444) fluidly coupled to the absorbent (324, 424) and the blister (304, 404) and configured to prevent fluid flow from the blister (304, 404) into the absorbent (324, 424) if the blister (304, 404) is moved from the expanded position to the collapsed position; and a second check valve (350, 450) fluidly coupled to the blister (304, 404) and an ambient environment and configured to prevent fluid flow from the ambient environment into the blister (304, 404) if the blister (304, 404) is moved from the collapsed position to the expanded position, wherein the blister (304, 404) comprises an enclosure forming a chamber having a fluid inlet (342, 442) and a fluid outlet (346, 446); a biasing member disposed in the chamber and configured to bias the blister (304, 404) to the expanded position, wherein the fluid inlet (342, 442) is fluidly coupled to the first check valve (344, 444) and the fluid outlet (346, 446) is fluidly coupled to the second check valve (350, 450); an enclosure forming a chamber having a fluid inlet (342, 442) and a fluid outlet (346, 446); a biasing member disposed in the chamber and configured to bias the blister (304, 404) to the expanded position, wherein the fluid inlet (342, 442) is fluidly coupled to the first check valve (344, 444) and the fluid outlet (346, 446) is fluidly coupled to the second check valve (350, 450); wherein the biasing member is a foam; wherein the foam comprises: a first foam (334, 434) having a first compressive force deflection; and a second foam (335, 435) having a second compressive force deflection. a first foam (334, 434) having a first compressive force deflection; and a second foam (335, 435) having a second compressive force deflection.