Building on the concepts introduced in Using Containers on HPC Resources, this session will focus on creating custom containers designed to run seamlessly on HPC platforms. Participants will learn how to build containers using Docker/Podman and Apptainer/Singularity, with practical examples on UCLA’s Hoffman2 cluster. Whether you want to create portable, reproducible environments for your research or are simply curious about containerization, this workshop will provide valuable hands-on experience and tools to get you started.