4-panel bags are constructed with four individual fabric pieces sewn together to form a square structure. The large amount of stitching makes the bags vulnerable for failure but ideal for storage due it its shape.
U-panel bags are constructed with three body panels that runs the full length of the bag forming the bottom and two sides and two additional pieces of fabric that form the other two sides. The U-panel bags will maintain a square shape when filled, with baffles. This is the industry standard and the most popular type of construction giving high safe working loads (SWLs) and solid durability
Bags made of a tubular piece of fabric that forms all sides of the bag allowing for stitching only for the top and bottom of the bag. Although the fabric is tubular, advanced sewing technology allows circular construction bags to maintain their square shape when filled.
FIBC bags are flexible and can bulge at sides when the material is filled and loses the normal square shape. Extra fabric panels or Baffles are sewn into each of the four corners to reinforce to hold the square shape and makes it comfortable for easy stacking, enhanced form factor and increased structural integrity. Baffle can be done U Panel and 4 panel bags.
