The Tetrad 60 carries a weekas worth of gear through the cobbled streets of old Avignon with the confidence of a mountain goat, and its 3-in-1 travel cover, ActiveShield compartment, and deployable daypack add adventure readiness for your weekend escape to Chamonix. Quick adjust torso length for a custom fit. Lockable zippers for added security while traveling. 3D Foam Breathable Backpanel.