Another improved version of @TheSameNameTwice boxes.(https://www.printables.com/model/56432-4-compartment-rugged-storage-box), remixed it improving assembly procedure and reducing some weak points.
The lever is now longer, to have a smoother closure and more durability. Moreover the latch has a 'B' structure to support flexibility without breaking easily.
Printed with tree supports to improve plastic structure but they may be not used.
Suggested a flexible material like PETG to ensure a better assembly of the hinge.
Bottom box can be printed in PLA, but cover is recommended in PETG.
The author remixed this model.
Reinforced hinge and lock mechanism.