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Honestly I don't understand how people can use bags instead of backpacks. Each time I go to some event or convention, I have to take, camera with either 24-70 or 24-120mm (sonny my -120 is f/4 and -70 is 2.8, I often take the first one), 70-200 2.8 (in case I would have to shoot scenes from larger distances), flash, battery for flash and spare for camera, some water, sandwich and similar small stuff. If I would take it all in a bag, my arm would scream after hour or two meanwhile good backpack allows me to go like this without issues. Even if I only need one lens of choice (like when during travel when it's usually 24-120 f/4 universal one, sometimes accompanied with 50mm 1.8 because it's so small and light), backpack is simply much more convenient.
But I'm just an amateur. I saw professional guys carrying few bags, tripod and light meters with them and two bodies with them so maybe I'm just too green for that.
