Guides / 05—08
Plan protective room on every side
Add clearance on both sides of each direction before comparing an object with a box.
Measure the object
Measure the object's outermost span. Choose clearance per side based on the material and vulnerability; this is the packer's decision, not a safety guarantee.
Calculate required inner space
For each direction, required space equals object size plus twice the per-side clearance. Compare that need with the box's inside size, not outside size.
Perform a physical trial
Geometric fit does not prove protection. Try the real cushioning, check whether the contents move and follow carrier guidance for the type of item.