FIBC Builders Bags at AirTech-UK: AirTech-UK is now the UK representative for a large-scale manufacturer of heavy-duty FIBC bags. Our standard, one tonne bags are designed to hold up to 1000kg. These strong containers are perfect for transporting bulk products. FIBC industrial containers are commonly known as one tonne, bulk bags, big bag, or super sacks. These flexible sacks are designed for storing and transporting products like sand, fertiliser, compost, bark chips, stone, aggregates, topsoil, etc. Standard One Tonne Bag: These FIBC sacks are made from heavy- duty, uncoated polypropylene fabric, with 4 x 30cm standard lifting loops. The sack measures 85cm x 85cm x 85cm.