The invention relates to the field of food packaging, in particular for food packaged under modified atmosphere. A food packaging tray, for watery fluid exuding food, comprises a perforated sheet material arranged above the bottom of the tray for supporting the food and defining, between said sheet and the bottom of the tray, a liquid chamber, the tray being characterized in that the perforated sheet material comprises a water reactive agent for releasing gas suitable to enhance the shelf life of the food, said agent being underneath the perforated sheet material.
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