Cabin storage on cruise vessels is engineered for space efficiency rather than comfort. A standard interior or ocean-view cabin provides a wardrobe, a small safe, under-bed storage, and a bathroom with limited counter space. Balcony cabins add a small outdoor area but do not materially increase internal storage volume. Suite categories provide more floor area and additional wardrobe capacity, which is relevant for voyages exceeding ten nights. Overpacking creates a measurable problem in this context: excess luggage occupies floor space and limits cabin usability for the voyage duration. Cruise lines publish maximum luggage dimensions for onboard storage, but these are guidelines rather than enforced limits at embarkation. Travellers on back-to-back itineraries — booking two sequential voyages on the same vessel — should plan laundry schedules to reduce total clothing volume carried. Most cruise vessels offer self-service laundry facilities or valet laundry services at a supplementary per-item or per-bag charge. The cost of onboard laundry should be factored into the total voyage budget, particularly for itineraries exceeding fourteen nights. Formal evening requirements are the most common source of packing miscalculation. Mass-market cruise lines typically designate two formal evenings on a seven-night voyage. Travellers who do not pack appropriate attire are restricted from main dining room access on those evenings and must use casual-dress dining venues, which limits the onboard experience relative to what the fare includes. Reviewing the dress code policy of the specific cruise line before packing eliminates this outcome.