Capsule hotel is a very high density hotel accommodation facility, commonly found in Japan. The space available to residents is limited to a small space of about 2 meters x 1 meters x 1.25 meters made of injection molded plastic or glass fiber, only enough to sleep. The space is usually equipped with electronic entertainment equipment such as TVs. There is a curtain at the entrance of the guest unit to maintain the privacy of the guest, but the sound is difficult to completely isolate, and the toilet and shower facilities need to be shared. These units will be stacked, and the luggage of the residents needs to be stored in a locker far away from the unit. The capsule hotel also has facilities such as restaurants or vending machines for the convenience of guests.