Meal replacement powders are generally sold in opaque, air-tight containers, and for good reasons. Exposure to moisture and excessive heat can cause the powder to clump, degrade, and develop an unpleasant taste.We recommend that you store your meal replacement powder away from direct sunlight, moisture, and rapid temperature fluctuations. Keep the lid closed while you’re not using it, and for extra peace of mind, store the powder in several small containers instead of one large one. Avoid storing your powder in the fridge, as this can cause moisture to accumulate.