When I came over to San Diego for the convention in 2014, I ran into a guy like that at the gate getting on the plane
This is likely due in part to the Anti-Gravity system as well as the compression straps on the sides and front of the pack that cinch down to keep weight tight or accommodate smaller volumes
These sizes vary most in terms of torso and hip measurements and are most often differentiated by their torso length
A single weed guard is usually enough to keep this pattern snag-free, but it can easily be replaced with a double post weed guard for heavy structure or grass
However, when we want to open the backpack in its entirety, all we need to do is to unfasten the Duraflex Mojave Autolock buckles (one or both), fastening the straps in the middle
But the Lazer Vento wins for me only because of my arcane head shape, and the way the retention basket cradles my head, and which keeps the helmet in place.