1. Size: The size of the fridge will depend on the amount of cake you need to store. If you have a bakery or cafe, you may need a larger upright fridge to store multiple cakes. If you are just storing cakes for personal use, a smaller upright fridge may be sufficient.

2. Temperature control: It is important to ensure that the upright fridge has accurate temperature control and can maintain a consistent temperature between 34-40°F (1-4°C). This will help to keep the cakes fresh and prevent spoilage.

3. Shelves: The fridge should have adjustable shelves that can accommodate cakes of different sizes. This will allow you to store multiple cakes at once and make the most of the available space.

4. Lighting: Some upright fridges have internal lighting that can help to showcase the cakes and make them more visible to customers. This can be especially important if you are using the fridge to display cakes in a bakery or cafe.

5. Glass doors: Upright fridges with glass doors can be a good option if you want to showcase your cakes while keeping them fresh. The glass doors can allow customers to see the cakes inside without having to open the fridge, which can help to prevent temperature fluctuations.

Overall, when selecting an upright fridge for storing cakes, it is important to consider the size, temperature control, shelves, lighting, and glass doors to ensure that the fridge meets your specific needs.