*Items made out of cedar wood decay slower. Containers made out of cedar do not reduce the decay of it's contents any more then a normal container would.
*Pottery reduces decay by about x1.5, depending on the quality.
*Backpacks (leather containers in general?) reportedly have a slight reduction on decay of items in them. (So less than pottery?).
*Stacking a container inside another container does not help. Neither do containers in the inventory.
**Except: It is suggested that stacking a container inside another container reduces the decay rate of the (inner) container. Which might be useful.
**Also except: It is suggested that if you put an item inside multiple containers (stacked containers), the highest QL container affects the decay rate of the item.
*Houses reduce item decay
*Raw materials decay faster then finished materials. (Raw materials being logs, rocks etc., finished materials being weapons, tools etc.)