When purchasing vacuum-packed furniture (often referred to as 'bed-in-a-box' or compressed furniture), the most critical factor is foam recovery rate. Ensure the supplier uses high-resiliency (HR) foam with a density of at least 30kg/m³ to ensure the product returns to its original shape within 24-48 hours after unpacking. Additionally, verify the tensile strength of the vacuum packaging film (typically PA+PE material) to prevent air leakage during long-term transit, which could lead to permanent deformation.