How do you guys handle lens changes when you are out and about taking shots? I have 3 lenses and a 2x teleconverter and a few filters and find myself fumbling to juggle all of this stuff in and out of the bag while making changes for different shots. The bag I have is partly to blame for this I think. I imagine something that would allow me to drop lenses in vertically would be more convenient but I have to work with what I have for now. The lenses I have are 28mm 2.8 a 50mm 1.8 and a 70-200 4.0 that I am not completely happy with but its the only zoom I have so I find it coming out at least once a session. Any tips? I have considered a second body (both to keep a different film loaded and for a different lens configuration ready to go) and a different bag but have not found the right one.