Provided is a device for treatment of wounds using reduced pressure, which includes a pump, a gas barrier cover, a first compressible material which expands after compression, and a second material capable of absorbing wound fluids several times its own weight. The first and second materials are arranged inside the cover and form a reservoir connected to the pump. The device also includes an inlet for connecting the reservoir with a wound, a wound pad to be arranged in the wound cavity, and a sealing covering the wound and the wound pad. A third material with high liquid spreading capability is arranged around at least a major part of the first material, and the second material is in the form of at least one layer arranged outside the third material and separated from the first material by the third material.
