According to Official Guinness Records,
The largest container of protein powder is 1,000 kgs (2,204 lbs 10 oz), achieved by True Nutrition and Douglas Smith (both USA) at the True Nutrition Office in Vista, California, USA on 2 May 2018.Douglas Smith and True Nutrition sold the protein powder made during their record-breaking attempt to raise funds for the Challenged Athletes Foundation.
For a complete list of 2018 records, please visit 2018 Guinness Records in United States.