For small base models (will work on larger base), simple system to lock the base in using the base angle to grip with.
Lid then fits over model and locks once slots are aligned and then rotated.
Can also be used as a stand.
Great for those models that have lots of features sticking out that makes it hard to get into the standard foam.
Printed on Ender 3 in PETG, the lid does need support for the tabs.