You can only tell how good a photo bag is after having used it for at least a few days. And with days I mean full days. Ten hours or more with lots of walking. Today, my wife used the F1.4 bag and since she carried only one camera and one lens, she stuffed the remaining space with womens things. After 8 hours of walking and shooting, she told me she thought the bag felt quite heavy on her shoulder. I tried her bag and it was twice the weight of my bag! No wonder why it felt heavy. If you’re going to walk around all day: pack light!