I designed a portable 3-tier box that can be used for hiking, traveling or storing tools. This system is assembled using snap fits and does not require glue, each element is designed to fit together perfectly. 

The 3-tier storage box also has a handle that has a locking mechanism in place.

Components: 

• Top lid
• Top box
• Middle box
• Bottom box
• Snap joints x8
• Handle with lock
• Piece of simple filament as hinge

Assembly:

Just insert the joints into holes using edge clips.