When assessing the price of a 20FT container, you must verify the material grade, typically Corten Steel (SPA-H) for atmospheric corrosion resistance. Ensure the floor thickness is at least 28mm using marine-grade plywood or bamboo composites. Check for CSC plate certification (International Convention for Safe Containers), which is mandatory for international shipping. Additionally, confirm the tare weight (approx. 2,200kg) and maximum payload (approx. 28,200kg) to ensure it meets standard logistics requirements.