5-In-1 Reflectors are an invaluable accessory for both indoor and outdoor photographers.
When used in the studio, they are perfect for reflecting light into dark areas, and can often be used instead of an extra light. And the black side can also be used as a "negative light" to add shadow where required, or to darken the edge of the subject.
And they can also be used in exactly the same way outdoors, to control the effects of the sun, and the diffusion panel can also be used to soften harsh sunlight.
They are available in a range of shapes and sizes, some models are fitted with one or more comfortable grip handles, threaded for attachment to a tripod or light stand, and each reflector folds down to a quarter of its size, and stores away in the bag, which is included free.