Hoi-Poi Capsules are the premiere invention of the Capsule Corporation. They can shrink down and contain large inanimate objects.
In Dragon Ball, Hoi-Poi Capsules, usually referred to as just Capsules, were invented by Dr. Brief as an extremely convenient way to carry items as large as small homes in a pocket-size container. They are similar to the Poké Balls found in the Pokémon franchise, but Capsules are only shown holding inanimate objects like vehicles and buildings. The Capsule Corporation was named after the invention. Along with his other inventions, capsules made Dr. Brief one of the richest and most successful men of his time.