I've been looking at something called GardenSoxx. Tubular, comes on a roll in different sizes, and you fill with dirt. It's made in USA and BPA free. Supposed to provide great drainage yet keep the plants moist. They say it lasts 2-3 years. You can fill and roll out a long piece and then slice the top where you want to put the plant. Looks interesting. Heres a link.
http://www.gardensoxx.com/
