The Corrections Department says it no longer has the space to keep storing large items on behalf of inmates.
Prisoners will now be allowed only personal belongings that fit in a standard plastic container measuring 50cm by 40cm by 30cm.
That means items such as large carvings and paintings will no longer be accepted.
Corrections Minister Anne Tolley says the department is not in the storage business. She says storage comes at a considerable cost and it's been problematic trying to keep track of inmates' property.