Gauge - 400g (100 Micron) Transport heavier wares safely and securely with our highly resistant 400g clear polythene plastic bags. Order online today Economy open ended clear bags suitable for heavy use. 250 WORTHMINSTER FOOD GRADE BAGS STORAGE BAG PLASTIC CLEAR 8 x 12 400g Food Storage Bags 8x12" (200x300mm) Boxed Polythene Bags (6 Thicknesses 8x12 Inch Plastic Bags Made from quality strong clear polythene Weller Clear Polythene Bags 250mm (10") x 300mm (12") - 125mu (250 per box) *. Pack Size. 1. Individual Price. £14.68. Individual Price. £17.62. Price. £14.68 Open ended bags, can be sealed with a bag neck sealer, heat sealer or with ties Protects against dust and moisture.