Roman barrels were important transport and storage containers, especially in the northern and western provinces of the Empire. Unlike amphorae, which were ceramic and common throughout the Mediterranean, barrels were made from fitted wooden staves held together by hoops. They were lighter, less fragile, easier to roll, and particularly practical for military supply networks moving along rivers and roads.
Several stave-built barrels are shown among the supplies transported along the river. Barrels were practical containers for bulk liquids and other provisions, although the relief does not reveal their specific contents

Roman grain sacks were used for moving dry provisions such as grain, flour, pulses and other foodstuffs. They were probably made from relatively coarse woven fibres such as linen, wool or other available plant fibres. Unlike amphorae or barrels, sacks were light, flexible and easy for one man to carry, stack in a warehouse or load onto a cart or river boat. Their main disadvantage was that they offered little protection from moisture, so dry storage was important.
For the army, sacks made particular sense at the final stages of distribution

The navis caudicaria river-transport vessels, were basically last-mile cargo vessels of Roman supply chains. Large seagoing merchant ships brought grain and other goods to Ostia and Portus, then the cargo was transferred to smaller caudicariae that could travel up the Tiber to Rome. The Ostia archaeological park explicitly describes this transshipment system and notes that grain was commonly moved in sacks.

Buildings behind the riverbank have been interpreted as possible horrea — Roman storehouses used for provisions and equipment. Their precise function cannot be established from the relief alone.