The best container size for construction equipment is the smallest unit that safely accepts the exact machine, its attachments and the external loading system—not whichever length sounds conventional. A 20-foot unit may suit one compact machine; a 40-foot or high cube may suit longer plant or several attachment sets. Measure the actual doorway and plant, verify floor and ramp loads professionally, and never operate an engine inside the container.
Use three gates before sizing a container for construction equipment
Measure the construction machine in its stored configuration
Compare 20-foot and 40-foot construction-plant scenarios
Treat the ramp, threshold and floor as one load path
Move the machine from outside with nobody in the pinch zone
Attachments require their own stability and retrieval plan
Issue a plant-specific storage schedule
Quote a container only after the plant plan passes
Provide the machine model, measured stored configuration, mass, attachments and proposed engine-off loading method so the offered doorway and floor can be reviewed.

