Tare weight is the empty weight of the container. Net weight is the weight of the cargo inside. Gross weight is the total — tare plus net. Every container has its max gross stamped right on the door. A standard 20 footer has a tare around 4,850 lbs and a max gross around 52,910 lbs. A 40 footer has a tare around 8,200 lbs and a max gross around 67,200 lbs.