The base plate has triangle shapes where you can put different modules. I've made some modules for myself:

• A phone, usb and sd card storage
• 2 modules to store my wallet. Yes I still use it after 5 years! :-) https://www.thingiverse.com/thing:123670
• A pen holder with 6 holes
• A tool holder for 3 bigger items
• A generic low container
• A generic higher container Combine multiple base plates to make a bigger base.