Our light duty bags are manufactured from 25 micron (100 gauge) polythene and suitable for lightweight products and small loads such as plastic or wood components. For collating heavier products, we recommend our medium duty 50 micron (200 gauge) bags. Very heavy materials and sharper edged goods are better suited to being packed in our tough, heavy duty polythene bags which, at 100 micron (400 and 500 gauge), have a higher resistance to tearing or bursting.