From the designer:

This is a custom insert that I have designed to fit your Milwaukee Packout to store your Makita Nibbler and accompanying kit. It specifically fits the Milwaukee 48228435 PACKOUT Compact Organiser.

The specific Makita Nibbler that this is designed for is model DJN161Z, link is provide here: https://www.makita.com.au/building-construction/category/cutting/metal-cutting/djn161z-18v-mobile-1-6mm-nibbler

We offer latches with tool names on them for all of our inserts.  You can order a pair of 5-compartment latches for an extra $6.