i currently use this bag for my gear
my filters & batteries & bits & bobs can fit in the top half, my camera & 4 lens's fit in bottom half & tripod attaches to side and is secured by a homemade velcro strap to top handle.
any way the back pack is very heavy when fully loaded but does a great job and is very comfortable when fasten up correctly.
my problems is that if i aint wearing a jacket the back pack makes be sweat like crazy at bottom of my back and its really uncomfortable having a damp shirt.
i am wondering if anyone else notice this with back packs but i am also curious as to if the Lowerpro Slingshot idea would be any better.
any help or advice would be greatly appreciated.