also, if you are having problems carrying stuff around might i recommend this bag or something similar. It’s a sling bag, that you wear as a backpack over one shoulder. You then slide it down and it sits perfectly on your stomach so you can unzip and safely pull out another lens. It’s big enough to carry your camera as well so you can store it when not shooting. But typically I carry the camera on one shoulder the the sling back over my shoulder at all times. The top pouch will hold cards and big enough to carry a speedlight flash as well. This is how I roll when I’m traveling.