There are also some other interesting, related formats outlined on this page: https://docs.pkgforge.dev/formats/packages/runimage

Formats that do something similar but not on that list that I also keep an eye on:

• https://github.com/fsquillace/junest (does require some setup steps but you can edit and interact, basically like distrobox but for just arch linux)
• https://github.com/Kron4ek/Conty (can't edit the environment, but it is presetup and compressed using squash making it useful for packing a tool or arch env)
• https://github.com/NilsIrl/dockerc