A lightweight packaging container for the preservation of fruits and vegetables is made from flexible polymeric materials that permit controlled ventilation, enabling the packaged produce to remain hydrated for a longer time, keeping them fresh without the need for refrigeration. The body of the packaging is made of layered polymeric materials. An embodiment includes an outer layer of polymeric material having a structural function, a second layer of porous polymeric material having a moisture-absorbing function, and a third layer of polymeric material containing micro-perforations that have a moisture-retaining function. The materials are pre-arranged in the center of the wider outer strip. The multilayer material is folded and the edges are heat-sealed to form a packaging bag with a flat base. A unique heat-sealing method allows only the edges of the polymeric layers to be joined, leaving the center portion thereof layered but not laminated.