Make sure trays are securely fastened when stacking.Use on a flat surface.Do not use if the size does not fit.Do not insert sharp or pointed objects.Do not use with heavy or breakable objects.Do not drop this product or hit it on other objects.Use and keep out of reach of infants.Do not use or store in a place subject to direct sunlight, high temperature or high humidity.Immediately discontinue use if the product becomes deformed or damaged.Keep away from fire and other sources of heat.Do not use this product for purposes other than its intended purposes.