This is another find from the NYBG Shop. These pots are beautiful, very tactile, and extremely light. They are called 'Coir', very eco-friendly and lightweight for their size and thickness. There are coconut coir liners on the market already, but these can stand on their own as pots - and function up to 5 years...
You can find all of the details at their website, Ecosource.com. These pots appear to be made from coconut coir that has been rubberized (just a guess). These pots are thick and spongy, rubbery, not brittle. And extremely lightweight. Great for outside, but you would need a tray underneath them to use inside.
Although these would need replacing every few years, it is a trade-off for the benefits: environmentally conscious, low energy manufacturing process, doesn't deplete natural resources, will not pollute the environment when thrown away, and they also have great air flow and drainage which benefits the soil and the plant roots. These are not exactly cheap - with prices on the trapezoid ones, above, running $38-$84. But they may become more affordable over time as they become more widely used.
matt at apartment therapy dot com