Ok so the other day I picked up a Pro Trekker 600AW to provide me with a more roomy, better harnessed bag which also allowed room for expansion of my gear over what my Minitrekker could hold. The biggest problem was trying to get a bag with a good storage space for other things (other than a laptop) like lunch and such 
However they only had the 300 and 600 on display and no 400 and I'm feeling, after a few days, that the 600 was maybe a bit too much all at once - that its a bit too big. The lenses I have (listed in my sig) almost get lost in the large deep bag, and I've got to learn to be creative to get them to sit without shifting around.
Thing is it just feels that it might be too much so I'm wondering how big the size reduction is down to the 400 version - whilst I've got time to exchange (and whilst the bag hasn't taken wear).
