How much kg of onion can a 40 feet container carry?

I'm afraid that this question is impossible to answer without knowing the exact volume of the container. But here is how you can find out your question:

Word Problem: Volume of the container [vc] divided by volume of an onion [vo] times the weight of an onion (the average weight would be around 13 oz) That is to figure out how many ounces, though. 32000 ounces are in 1 ton, though.

Equation: vc/vo*13=number of ounces of onions that would fit into the container