The bucket has been an indispensable tool of human development since the dawn of our agricultural revolution. Dating around 3700 B.C., the earliest known bucket was found in Germany’s Upper Rhine Valley, in the city of Reute. ePackageSupply 5 Gallon White Plastic Bucket $7 at Amazon Deli pickle buckets are an excellent choice for mixing thinset and concrete. Used 5-gallon paint buckets work well, as do empty joint compound containers. Jut remember to choose wisely regarding your task, so your job doesn't wind up going straight to heck...in a bucket.