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in the 1940s and 50s the empty canal was used by a chemical and plastics company to dump nearly 20,000 tons ( c.18,000 metric tons ) of toxic waste ; the waste was sealed in metal drums in a manner that has since been declared illegal .
 content container: waste, metal drums
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  waste, metal drums 
Answer:
 content container: waste, metal drums