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 enters into force as of 1 September 2021 (with some exceptions) and is applicable on new situations and contracts as of that date. Parties can however opt to make the new law applicable on 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.