Traditionally shaped square wood baskets, with hangers included.
Wood baskets are a natural and attractive solution for growing many plants that either resent growing in the more strict confines of plastic or clay containers. Likewise, the three dimensionality of wooden basket containers allow for some medium around the roots which prevents the roots from drying as quickly as would a similar plant growing on a slab or mount.
We've tried many items to line our baskets and find nothing works better than Coconut Fiber. Simply pull the fibers into a thin layer and place it around the inside of your baskets, then fill with your favorite growing media. It's stong and permanent yet allows the roots to easily grow to the outside.