Three elements are generally necessary for the existence of a bailment: delivery, acceptance, and consideration.
Actual possession of or control over property must be delivered to a bailee in order to create a bailment. The delivery of actual possession of an item allows the bailee to accomplish his or her duties toward the property without the interference of others. Control over property is not necessarily the same as physical custody of it but, rather, is a type of constructive delivery. The bailor gives the bailee the means of access to taking custody of it, without its actual delivery. The law construes such action as the equivalent of the physical transfer of the item. The delivery of the keys to a safe-deposit box is constructive delivery of its contents.
A requisite to the creation of a bailment is the express or implied acceptance of possession of or control over the property by the bailee. A person cannot unwittingly become a bailee. Because a bailment is a contract, knowledge and acceptance of its terms are essential to its enforcement.
Consideration, the exchange of something of value, must be present for a bailment to exist. Unlike the consideration required for most contracts, as long as one party gives up something of value, such action is regarded as good consideration. It is sufficient that the bailor suffer loss of use of the property by relinquishing its control to the bailee; the bailor has given up something of value—the immediate right to control the property.