For US ocean shipping by container, the quantity of goods mainly depends on the minimum shipment volume and the size and weight of each piece. Usually, the minimum shipment volume is 0.5-1 cubic meters (or 1 ton), and the weight of each piece is mostly limited to within 200-500 kg. The specific requirements depend on the regulations of the freight forwarder. 
 Minimum shipping threshold 
• General standard: The mainstream unit is 1 billing ton (1 CBM or 1 ton), and any quantity less than this is typically calculated as 1 billing ton. 
Special case for small cargo: Some dedicated lines or freight forwarders support a minimum shipment volume of 0.5 CBM, but the unit price may be higher.
• Billing logic: The charge is based on the larger value between volume and weight (typically 1 CBM = 1000kg). 
 Individual Specification Limitation 
• Weight Limit: Generally, a single item is recommended to weigh no more than 200kg. Some items are allowed up to 500kg. Items exceeding this weight require special handling. 
- Size Limitation: The total length, width and height should be no more than 3 meters. For oversized items, please confirm in advance whether they can fit into the container. 
Other invisible restrictions 
• Number of customs declaration applications: Generally, one container can accommodate up to 4 to 8 shipments (depending on the customs declaration documents). Exceeding this number may be subject to customs restrictions. 
- Cargo Attributes: Hazardous goods and prohibited items cannot be consolidated. Some sensitive goods (such as food and liquids) require special channels.