A ball bag can be:-

• A bag for keeping or carrying balls in.
• A gag for silencing someone.
• A colloquial name for the scrotum.
• A soft ball-shaped device that encloses the penis and testicles, described here:-

Ball bags intended for bondage play are typically made of leather, PVC or rubber. The opening of the bag typically has a strap drawn tight around the base of the testicles and may feature means for locking. Most ball bags are large enough only to accommodate a flaccid penis and are designed to make erections uncomfortable. Some models incorporate weights for stretching the genitals. In some male mammals, the scrotum is an external bag of skin and muscle containing the testicles. ... The penis (plural penises or penes) or phallus is an external male sexual organ. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... A model in bondage cuffs with a leg spreader In the context of BDSM, bondage involves people being tied up or otherwise restrained for pleasure. ... Modern leather-working tools Leather is a material created through the tanning of hides, pelts and skins of animals, primarily cows. ... Polyvinyl chloride, commonly abbreviated PVC, is a widely-used plastic. ... Rubber is an elastic hydrocarbon polymer which occurs as a milky emulsion (known as latex) in the sap of several varieties of plants though can be produced synthetically. ... A modern padlock. ... Erection of many tissues can occur in both sexes during sexual arousal. ...

Some male sadhus (or ascetics) of the Vaishnava branch of Hinduism wear as a symbol of austerity an arbandh, or a metal ball bag slung on a girdle about the waist.[1] In Hinduism, sadhu is a common term for an ascetic or practitioner of yoga (yogi) who has given up pursuit of the first three Hindu goals of life: kama (pleasure), artha (wealth and power) and even dharma (duty). ... Asceticism denotes a life which is characterized by refraining from worldly pleasures (austerity). ... Vaishnavism is the branch of Hinduism in which Vishnu or one of his avatars (i. ... Hinduism (Sanskrit/Hindi —, also known as , and ) is a religion originating in the Indian subcontinent, based on the Vedas and the beliefs of other people of India. ...

A different type of ballgag is a gag that is placed inside of a person's mouth. The typical ballgag consists of a rubber (or other various materials) ball that has two straps connected to it that buckle behind a person's head.