The only thing I don't like about petrols are the clear covers, they don't make a complete seal all the way around. They only velcro at the top and bottom, otherwise they are alomst perfect for what we do. I have a 3 shelf sonicase which to me is awesome. I wish I would have purchased the 4 shelf, but i like how the bag seals up compared to the others on the market, its large enough for what I need and with a little organizational skill you would be amazed what I get in my 3 shelf bag. I agree with others as well Lowpro's are nice too. I have a buddy who uses Lowpro and loves them...
ook