The Mars Project Backpack comes stock with a Fidlock Magnetic Closure Buckle V-Buckle. The strap is removable and can be swapped with an AustriAlpin COBRAA(R) for a different look. You will receive both the Cobra and Fidlock buckles when you order a COBRA upgrade.All COBRAs are machined from the highest grade 7075 aluminum alloy and feature solid brass and stainless steel components.Frame tested for 2000lb / 9kNHigh-grade 7075 aluminum alloySolid brass & stainless steel components2" / 50mm size buckleWeight w/ webbing : 0.25 lbs