Purpose: The purpose of this paper is to describe the use of XML formatted data unit (XFDU) technology to implement OAIS-based information packaging in the CASPAR project. Design/methodology/approach: The paper outlines new tools and techniques in working with XFDU for the purpose of preserving complex digital information. Findings: The preservation of digital assets was facilitated by using the features of XFDU in the CASPAR project. Practical implications: The paper is of interest to those responsible for the archival or long term preservation of digital assets. Originality/value: The paper demonstrates new tools and techniques, which together provide an integrated system suitable for solving complex issues of preserving digital assets using information packaging. © Emerald Group Publishing Limited.