I store my dry laundry detergent in a plastic bin that has a tight fitting lid. This keeps the powder grainy and loose, so there is never any clumping. If you mix it with the water in the washer before you add the clothes, you don't need to use the expensive liquids.
By Quiltmum from Ontario, Canada
This page contains the following solutions.
I have just added a plastic flip top trash can, to my laundry area. It holds two big boxes of dry laundry powder. Makes it very easy to open the lid and fill the cup with soap for the washer.