Gregory Katmai 55 Walking backpack (55 l - S/M, black) - The Katmai 55 from Gregory is incredibly comfortable and spacious. Thanks to its great design, the versatile backpack is guaranteed to be comfortable to carry, and it won’t restrict your movements. Featuring mesh back and shoulder pads, the air will circulate between your body and the backpack and reliably wick moisture away to the outside. In addition, the backpack is equipped with a snug carrying system to ensure it remains firm on your back, yet it allows lots of freedom of movement.As for storage space, the Katmai 55 is equipped with a spacious main compartment, a separate sleeping bag compartment and numerous smaller pockets that help organize your gear. Plus, it’s compatible with most commercially available hydration systems, and you can hang a bottle on the hip belt.