There would be a tendency to use the top part of the refrigerator as an additional storage facility since many times it is not used. This is convenient, but this environment is subject to heat, vibration, greases, dust that cannot be accessed and some of which can be easily destroyed or it may involve security issues. Whatever you place there up is more important than most human beings know particularly when it comes to the goods that are sensitive to temperature and cleanliness.
Cooking oils and vinegars

The heat produced by the refrigerator would rancify oils faster, and may cause a change in the flavor of vinegars. Prolonged exposure to a warm environment decreases the shelf life and quality. The nutritional content and taste of products in bottles are subject to loss with time.
Medicines and supplements

Change in temperature may decrease the activity of drugs and vitamins. Stocking them on top of the refrigerator will create losses in terms of heat and unreliable dosage values. This may prove very devastating in cases where there are drugs that need to be kept at a constant temperature.
Bread and baked goods

The gadget dries bread on a fast rate resulting in staleness and molding. Such a storage will rather result in less fresh than fresh. The long shelf life of baked goods in a package may also help the male odor or to absorb the smell in a kitchen.
Spices and herbs

Light and heat ruin and decompose the spices, and cause them to lose their strength and smell. They are too easily spoiled by being kept in a place where the fridge is. The spices on the ground are also highly prone and can easily go stale.
Paper products

The grease and moisture in the atmosphere gets readily absorbed by paper towels, napkins and even the cardboard pack. This may give rise to bad odours, discolouration and less usage. They would not be frequently hygienic to use when dirty.
Cookbooks

Coverings can be twisted, bindings can be unscrewed, pages can be oily, hot and damp. The shelf above the refrigerator is expected to age with cook books in a shorter time than other cook books in shelves. The pages can also be glued or curled in moisture.
Cleaning supplies

The chemicals that are exposed to heat run the risk of losing their properties or spilling under pressures. Other products also produce fumes that are more when heated. This poses this as an unwarranted safety hazard in a warm kitchen.
Glass containers or jars

Fridge goals have the capability of moving to the top because of vibration. The glass containers are very unsafe in the presence of fall and result in injury or damage. Powerful jars may rupture due to constant changes of temperature.
Small electric appliances or electronics

The accumulation of heat and grease may damage internal parts. The objects which are not needed constantly may also be worn out by time since they are in constant warmth. The dust deposition also can make the blades shorter regarding the usability.
Pet food

The fats in pet food can be spoiled before freshness and nutritional value due to heat. Shelves that are stored above the fridge may also be infested by pests. This may endanger the security of pets and food.
Decorative items

Dust, grease and heat perforate ornamental work at an extremely high speed. The products in the high position are also forgettable thus prone to falling or breaking.