Our FIBC tonne bags come with a 5:1 safety factor rating, meaning that each bag is fully certified for a single trip at a load of 1000kg; however you can of course continue using the bags in a wide number of applications. Each dumpy bag comes with a stitched certificate. Builders bulk bags have an open top and flat bottom, reinforced stitched seams and 4 reusable lifting loops stitched onto each top corner. This makes for easy carriage with a forklift, or for use as manual handles. Easy to clean and fold away for convenient storage these Industrial standard one tonne builders bags are ideal for the transportation of heavy aggregates, building materials and granular products.