The square planters are for both outdoor and indoor use.
They come in various sizes
Size 1(480ml) at 200
Size 2 (1.2litres) at 300
Size 3 (1.95litres) at 350
Size 4 (3.4 litres) at 600
Size 5( 5.6 litres ) at 900
Size 6 ( 15 litres ) at 1500
Size 7( 29 litres ) at 2000