GORUCK only chooses tested and proven materials that can withstand any environment. That’s why they took the original GR1 rucksack and built it with X-Pac® and YKK AquaGuard zippers. X-Pac® is lightweight, ultra-durable, and waterproof—ready for the rain-soaked trails to city streets, giving you the confidence to carry your gear in all conditions. Exterior built out of X-PAC® VX21: A tough, lightweight, waterproof material Opens flat making it easier to pack and organize Extra padded shoulder straps and top handle Waterproof YKK AquaGuard exterior zippers Suspended laptop compartment with YKK AquaGuard zipper A removable, hard plastic frame sheet stabilizes the laptop compartment Small hidden zipper pocket underneath the handle Large elastic pocket, large mesh zippered pocket, small go-to pocket External Slant Pocket for quick access to keys, snacks, and other small items 3 rows of internal MOLLE webbing