Natural Fibre Bilum BagNatural Fibre Bilum Bag This bilum bag is hand woven from 100% natural fibre sourced from the bark of a special tree from the surrounding vegetation. Dyed using wild berries, fruits and roots. The process of making a natural fibre bilum is painstaking and takes many weeks. Shrub barks are beaten into loose stripes and are dried in the sun. The dried strips are then twisted by placing the fibres on the weaver's thigh and are rolled in a backward and