Small bathrooms ask a lot from a humid room. Keep frequently used items reachable, keep backups contained, and avoid storing products in conditions their labels do not support.
Separate daily use from backup stock
Give daily products a limited, wipeable zone. Store backups together and set a capacity limit so duplicates stay visible. Keep the sink edge as open as the layout allows; every object left there adds a step to cleaning.
Plan for water and airflow
Do not block vents or crowd damp textiles. Let towels and cleaning cloths dry fully before placing them in enclosed storage. If you find a persistent leak, damaged surface, or substantial mold growth, the organizing task stops until the source is assessed and repaired.