The bog offerings of the Balts dating back to the period from the first century to the first half of the eighth century, and found in the Nemunas-Daugava interfluvia, are studied as part of the panhuman experience, and as a result of the influence of the Germanic culture of a period covering the Roman Iron Age and the Migration Period. In the lands of the Balts, however, offerings in water turned into a self-contained phenomenon known until historic times. This article discusses the links between bog offering sites and sacred waters. It discusses the position of bog offerings in the archaeological complex, the composition of offerings and changes in them, and the main intentions of the offerings, which can be characterised as offerings of war booty (to the god of war, as proof of a warrior’s honour), the transfer of valuables into the transcendental space (give to get back), and communication with the gods and with ancestors (requests and tokens of gratitude).