Compostable liners should be stored in a cool dry environment. Liners will not biodegrade in storage, biodegradation will only be initiated in a compost environment in the presence of micro-organisms, humidity and warmth. However, over time, the material may lose some of its mechanical properties and weaken.\r\n\r\nTo ensure optimum performance we would recommend purchasing no more than you would expect to use over a 12 month period.