So I'm digging my 33 now after picking it up yesterday. I'm going to rig a sternum strap on there somehow from REI and I will post pics if anyone is interested. This is the first pack I've bought that I was immediately happy with (besides the strap and lack of water bottle attachment outside). There is plenty of room in the lower compartment for my whole kit including hoods and I can access my three lenses, flash and body by the side access thanks to the two tabbed dividers with only the circles of Velcro.
quick tip for holding bottle (which is a drawback of the 3n1 xx): use a caribiner and attach it to either the metal tripod loop in back or the lower right or left metal loops that hold the straps--it's worked for me.