On 17 March 2020, the law of 4 February 2020 containing Book 3 "Goods" of the Civil Code was published in the Belgian Official Gazette. The main goal of the legislator was to better structure, modernise and integrate (the rules of) the law on goods into a single code. Moreover, the new law on goods had to be functional, useful and flexible. The new law came into force on 1 September 2021 and is applicable to new situations and contracts from that date. However, parties may choose to make the new law applicable to facts and agreements dating from before that date. The Book 3 provides us with a set of rules with a new - sometimes delicate - balance between freedom of contract and legal certainty.