Smart Pots aerate plant roots which results in superior growing abilities and bigger plant yields. Soft sides conform to any surface shape. BPA-free and lead-free. Includes heavy-duty 1-inch Polypro strap handles with a minimum break strength of 600 pounds per inch. Aerates plants roots which results in superior growing abilities and bigger plant yields. Air root pruning - when a root grows to the fuzzy inside side of our container, it hits the air causing the root tip to stop and initiates lateral rooting within the root system. Soft sides conform to any surface shape. Soft sides work like a filter to keep planting media in. Moisture wick action moves water all over the container.