Cooking Containers should be made heat safe materials. A dark, thin metal container works well (graniteware, dark nonstick pots/pans). Cast iron takes a long time to heat, but keeps the heat a long time and can keep cooking if clouds pass by. Glass cookware allows the cook to see the food without having to open the container, but may not conduct heat as well as black metal.
A glaze (or heat trap) is the item that traps the heat in the cooker. (It's like when a car in the sun is hotter than the air outside of it.) Tempered glass, plexiglass, and plastic all work. Glass bowls, glass air fryer bowls, aquariums, old windows, plastic wrap, glass jars, and baking bags for the oven. When using plastic bags that aren't oven safe, make sure they don't make toxic fumes when heated and keep them from touching the cooking container by using something like wire.
Reflectors help increase the heat in the cooker. Mirrors, foil, mirrored stainless steel, car shades, and mylar all work to redirect sunlight towards the food.
Wood and cardboard can be used in box cooker as the walls of the cooker. Even though the solar cooker can get very hot, these materials will hold up. If building cookers from wood, they can start getting heavy. Cardboard is not very durable for long term use. However, they are great for testing out new cooker designs.
Adhesives should be able to handle heat and not release any fumes. Nontoxic, white school glue will work for foil and cardboard reflectors. The glue can be thinned with a little water to make it spread easier. Washable glue is not recommended. HVAC tape works well. It's reflective and sticks well. Do not use duct tape on the inside of a cooker. It smells awful when heated to high temperatures. Packaging tape is not recommended. Rubbing scissors with oil on some paper towel will help remove tape adhesive.
Racks or pot stands help the hot air go around the cooking container better. Wire racks, canning lid bands, 3 sticks, and 3 rocks all do the job.
Additional items are handy to keep nearby. A thermometer helps to make sure that the solar cooker gets to a safe cooking temperature. Oven gloves keep fingers from burning on the hot cookware. Sunglasses protect eyes from being blasted with light from the reflectors. Insulation prevents heat loss and keeps the temperature consistent when clouds pass by.