The multiple boxes can be easily stacked and locked on top of one another. You can also buy separate inlays for the cases to fit your desired tool.
Makita P-83696 Makpac Interlocking Case 3 Row Insert Tray
Makita Interlocking Large Insulated Cooler, 8-1/2 x 15-1/2 x 11-5/8 with bonus Medium Tool Box, 6-1/2 x 15-1/2 x 11-5/8 198276-21972117 - The Home Depot
Makita 12 Draw Bit Box Storage Case Makpac 3 P-84327
Makita MAKPAC Cool Box Connector Tool Case Systainer 11L 198254-2 Type 3 11 Litres +
Makita Makpac Connector Case Type 2 - 821550-0
Makita A-60523 Type 3 Mac Pack, Blue
Makita MAKPAC Stack 2 Piece Connector Stackable Tool Case Type 1 and 2 Cases Buyaparcel
Makita 198253-4 - Estate MAKPAC 18 L, blue, silver
Makita 821550-0 Makpac Connector Stacking Case Type 2 (No Inlay) Triple Pack
Makita 4 Piece MakPac Connector Stackable Power Tool Case Set and Case Trolley