In reply to StuLade: is this the elastic type cord ? if so i find dipping the ends in super glue and tapering it to as much of a point as possible helps rethreading still a pain though.
In reply to davy_boy: No, static cord. Have resorted to just cutting a small hole on the inside of the bag where it threads out of the top to help push it through, can always patch it later if need be.