Types of Bag Construction for Flexible Intermediate bulk containers

U-panel construction 

U-panel bags are constructed with three body panels – one that runs  the full length of the bag forming the bottom and two sides of the  bag and two additional pieces of fabric sewn into the larger piece that  form the other two sides. The U-panel bags will maintain a square  shape when filled, especially a U-panel bag with baffles. U-panel bags  are an industry standard and the most popular type of construction  offering high safe working loads (SWLs) and solid durability.

Circular construction 

Circular bags are made with 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. This is a common misconception with circular bags  regarding their filled shape. They aren’t literally circular; they are  simply constructed with a single piece of fabric that forms all four  sides of the bag. While they still resemble square/rectangular FIBCs,  they will hold that shape the least of the construction types when  filled.

4-panel construction 

4-panel bags are constructed with four individual pieces sewn  together to form a square structure. When filled, a 4-panel bag will  hold its square shape similar to other construction types.  Typically, 4-panel bags will hold their shape better than the U-panel  bags, and a U-panel bags will hold their shape better than a circular  bag. The biggest drawback to 4-panel bags is the large amount of  stitching required to keep the bag together. This can allow for more  areas of the bag prone to failure. However, 4-panel bags are ideal for  storage due to the way they hold their shape when filled.

Baffle construction 

Baffle jumbo bags are normally constructed with U-panel, 4 panels or Tubular shape structure. It has four panels on each corner inside the bags to keep the bags form-fit after filled with products.

This construction can prevent bags bulging when loading into containers. Regarding to food grade bags packaging, we can provide food grade baffle liners inside the outer bulk bags which can also 

completely instead of the baffle struction for usage.