There is no specific answer to this as it may differ based on the candidate but the answer should include awareness of organisational efficiency benchmark and willingness to follow proper safety procedures e.g

“Good stacking techniques can vary depending on the kinds of things we’re housing. If I’m dealing with square boxes, I’ll organize several of them into a cube pattern and alter the angles of each level. Doing this can prevent the whole stack from collapsing and causing injury if someone bumps it.”