I asked for a bunch of pieces for Christmas and my birthday this year and unfortunately one of the tall center sections has a notch in the zipper so the zipper splits when you try to move it past that section. I submitted a request to the customer service since I’ve only had the bag for a month and the zipper was a problem on the first trip I took it out on and I’m waiting on the customer service to respond. I love the front cap and all the compartments. The flex array kit is awesome for organizing and I’ve ordered a second one. When you put the larger center section on it tends to spin on its side and is not very stable when on the wheel cart. Also when converted to a backpack it tends to lean and not sit very comfortably. Over all I love the concept and functionality but there is room for improvement.