You don't have to be into hydroponics to find utility in these great stackable pots.  Fill them with soil and use them anywhere you would use a traditional pot!
 
Simple: Plant, Stack, & Enjoy
Made With Food Grade Plastic
Grows Flowers, Herbs, & Vegetables
Just Water the Top & All Tiers are Watered
 
Tray with Rollers Sold Seperatley.
 
Specs:
Product Dimensions: 18" x 18" x 7.5"
Volume: 12.5 Quarts
Diameter: 18"
Material:  Polypropylene #5, Food Grade Plastic
Color:  Terra Cotta