These bags will hold a lot of weight. One of the reasons for that is because the flap, back, bottom, & front are all one piece of canvas. There is no bottom piece or bottom seam to tear out on these bags. The body of the bag is all one piece for maximum strength.
Most commercial fishing bags have pockets on the front, just like these ones. However on most bags those pockets are made from one or two pieces of material that's just been sewn onto the front of the bag. My bags have another layer of material on the front. You see, on my bags the pockets are first sewn onto another piece of canvas the size of the bag front. This unit is then sewn onto the front of the bag. This makes the front of my bags two layers thick behind the pockets. All this adds strength to the material. It won’t rip & it’s very resistant to punctures.