From Material Gear:

“A minimalist 21-liter backpack, the GORUCK GR1 can be carried from office to operational tours at the blink of an eye. Made from Special Forces-grade material, the GR1 benefits from a lightweight 1000 Denier CORDURA to add durability and strength, proven to thrive in war zones. Exterior features include a covert bombproof laptop compartment next to your back that can carry laptops up to 15-inches.”

Read more here.