Utley Sort
The Utley Sort was created because I was reloading on a progressive press and kept getting stoppages and powder spills due to .380 cases being mixed in with the 9mm. It lets you easily see the cases that don't belong. You can also see the inside of all the cases to check for trash that may be stuck. With a piece of plexiglass, you can also flip the cases over and easily inspect the case heads.
There are three sizes, small, large and x-large. Look for the size you want to sort and choose the one that fits your needs.