4 Panel Bag

4-panel bag is 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.