When selecting a backpack, one of my requirements is the pack needs to look like a plain backpack. I don't want anything fancy that looks like there's something expensive inside. I don't want any logos or writing on the outside that let's people know there's a drone inside. It needs to look mundane, but comfortable when backpacking. It turns out the foam insert type of backpacks offer the most protection, and they are the most restrictive. They also have the least room for extra stuff, like iPad, hood, harness, windsurfer, Itelite, MarcoPolo receiver, GoPro, etc. The re-configurable "wall divider" type of backpack is what I settled on from Think Tank for $249, but Pro Craft ($119-129) makes an almost identical pack for less money that looks like the best value. These reconfigurable type with movable walls, attached with Velcro, offer the most flexibility IMO.