Originally posted by grhazelton I bought one to carry my LX outfit, freeing up my Lowe for the 654n. While the Amazon Basics is a fine bag and a screaming value, I think it would be a little small for a 645 outfit. My Lowe is pretty well filled with the 645 and its lenses, 35, 55, 75, 120 and 200, plus ref converter, lens shades an extra insert or two, and what else...film.
I agree on the amazon pack, no way it will comfortably carry everything the OP wants. I have a similar bag and while it could theoretically hold all of that gear, I wouldn't feel safe (as in the straps might break!) or comfortable with a full day of use.
I really like the dakine sequence - it is a full fledged camera bag, with a deep gear section (had no problems with a gripped k5 or k20, and sigma 120-400mm with the hood extended down the middle). While being a full fledged camera gear bag, it is made by a company that makes backpacks first, and is very well supported to handle a lot of weight. The large section also opens inward (towards your back, so it has to be removed to get to your gear). Nobody will be getting into the bag but you when it is on your back.