A biodegradable natural-fiber disposable food storage container for storing a serving of food is formed of an envelope made of a generally unitary blank of a suitable paper that is generally resistant to food fluids such as blood, juices, sauces, etc., but admits at least some permeation of water vapor and atmospheric fluids. Accordion-fold side panels allow the envelope to store flat and open up to accommodate the food article. Two half-panels join at an overlap to form a closed front panel. A water-based glue closes the envelope sides and base, while a repositionable adhesive on the flap closure allows the envelope to be opened and resealed.