Starting out let me say that this bag is made for travel. My DSL Propack on any given day weighs in around 30 to 35 pounds. It has seen just about every weather situation and has been a beast in the elements. The DSL Propack holds a lot of gear and is definitely a great choice for any photographer with lots to carry around.
There are a ton of different ways to configure this bag for anything you are packing. So there is a lot of space. I have 2 full frame pro bodies with large lenses in this bag at all times as well as a 17" Surface book 2, 3 HDD, 2 external SSD drives, cables galore, charges everything.
MY only issue with this product is that it just doesn't seem to hold up. I warranty replaced this same bag within a year of owning it, due to the stitching along the edge of the shoulder straps fraying and coming apart at the seams. This replacement held up a little better, but almost 3 years later it looks like its 10 years old. This bag failed in the same spot, just got much worse as time went on. I dunno if I will purchase this bag again as both bags stitching failed in the same fashion. I really do LOVE this backpack; I just wish that it held up better over time.