Once exposed to air, kibble fats slowly oxidize and vitamins degrade, so aim to finish an opened bag within four to six weeks and split large bags into portions.
Keep food in its original bag inside an airtight bin rather than pouring it in directly; the bag has an oxygen barrier and lot numbers for traceability.
Store in a cool, dry, dark place away from stoves and sunny balconies, and consider food-grade desiccants in humid climates.
Stop feeding if you smell rancidity or see clumps or mold, or if the cat suddenly refuses it; opened wet food needs refrigeration and use within a day or two.
