The size is relevant with the void/gap of the goods/cargo,and also with the deepth of the cargo/goods.
Generally,we think the relationship as follows:
1.200mmgap/void,use the dunnage bag width is 500mm
2.300mmgap/void,use the dunnage bag width is 800mm
3.400mmgap/void,use the dunnage bag width is 1000mm
4.500mmgap/void,use the dunnage bag width is 1200mm